Nearly a dozen member-versus-member contests will take place this fall after states redrew congressional district lines to match new Census data, and newly filed campaign finance reports show the money chase is in full swing for incumbent lawmakers doing battle with their colleagues.
Lawmakers facing off in contests in Illinois, Iowa, Louisiana, Pennsylvania, Ohio and Michigan reported raising more than $1 million in 2011, according to year-end Federal Election Commission reports filed this week -- meaning they will have plenty to spend to attack each other.
Here's a state-by-state breakdown:
A new congressional map in Arizona added a House seat but overhauled districts held by freshman GOP Reps. Ben Quayle and Dave Schweikert, prompting the latter to jump into the new Scottsdale-based 6th District. Quayle has yet to announce his intentions, but it is widely assumed that he wants to run there as well.
Should the Republican duo face off, Quayle, the son of former Vice President Dan Quayle, would be ahead financially, having raised more than $950,000 in 2011, including $262,000 the fourth quarter.
Quayle banked nearly $692,000 at the end of the year, posting a small $6,000 debt largely tied to consultant fees.
Schweikert reported $817,000 raised for the year with $170,000 of that rolling in in the fourth quarter. He had $700,000 in the bank but had $100,000 in debt from a personal loan he made the campaign in December.
The Golden State didn't lose any of its 53 seats in Congress during reapportionment, but California's new nonpartisan redistricting commission kept the process lively when it carved up existing districts to draw the state's newest congressional map -- prompting at least two member-versus-member matchups.
California also implemented a new "jungle" primary system, under which the top two vote-getters, regardless of party, advance to the general election. That creates the potential for some incumbent battles that could last until the general election.
Democratic Rep. Janice Hahn, who won a special election to replace ex-Rep. Jane Harman (D) last year, will take on fellow Democratic Rep. Laura Richardson in the new Los Angeles-area 44th District.
Both lawmakers posted campaign finance sheets in the red at the end of 2011.
Hahn reported nearly $157,000 in debt, largely in consultant and printing fees. She reported no loans. The Democrat's campaign told the Los Angeles Times the debt was tied to her special election campaign.
Hahn raised $226,000 in 2011, including $77,000 in the last quarter.
Richardson's balance sheet shows debts of nearly $438,000, including a nearly $100,000 bill from the law firm Perkins Coie and nearly $215,000 in fees from Encino-based Shallman Communications. Richardson revealed in November that the House Ethics Committee is investigating whether she used government staffers for political work.
Richardson maintained a fundraising edge over Hahn with $313,000 in 2011, including $103,000 in the last quarter. She reported $132,000 on hand.
Democratic Reps. Howard Berman and Brad Sherman are also facing off after the nonpartisan commission pushed both lawmakers' homes in the Los Angeles-area San Fernando Valley into the same district.
Berman and Sherman will face the challenge of distinguishing themselves to voters in the district, and both are expected to draw on significant campaign accounts. The new seat is made up of about 20 percent of Berman's current district and 60 percent of Sherman's current district.
Berman reported a haul of nearly $2.4 million in 2011, with nearly half that amount coming in in the final months of 2011 when he raise more than $1 million.
He reported nearly $2.9 million on hand and about $24,000 in debt.
Sherman reported $841,000 raised in his year-end report with $126,000 in the final month of the year.
Although Sherman's report states he has about $3.7 million on hand, a footnote to the report states that value should actually be about $4.3 million, citing investments the campaign made in U.S. bonds.
"This is because the Committee's U.S. Government Bonds have a fair market value of $592,062.87 more than the Committee's initial investment as of December 31, 2011," the report states. "The Committee has provided this information in order to disclose a cash on hand figure that reflects the resources available to the campaign."
Sherman also reported $252,000 in debt, including a $250,000 loan from the candidate.
When the state lost a seat to reapportionment, Democratic majorities in the Illinois Legislature reconfigured the state's remaining 18 districts to favor their party, forcing veteran GOP Rep. Don Manzullo to face off with freshman Republican Rep. Adam Kinzinger.
The pair will compete for the state's 16th District, which stretches from Boone County along the state's northern border to Iroquois County on its eastern edge. Kinzinger, an Iraq War veteran who defeated Rep. Debbie Halvorson (D) last year in a bid assisted by tea party activists, outraised Manzullo in the fourth quarter and year-end totals.
The freshman lawmaker reported raising $286,000 in the year's final three months, bringing his 2011 total to more than $1.1 million. He banked $651,000 at the end of December.
Manzullo raised nearly $602,000 in 2011, including $170,000 in the fourth quarter. He had $523,000 on hand at the end of the year.
Neither candidate reported any debt.
When redistricting in the Hawkeye State bumped Republican Rep. Tom Latham into a potential primary with fellow GOP Rep. Steve King, he headed south to the 3rd District seat held by Democratic Rep. Leonard Boswell.
Latham hit the hustings hard in 2011, raising nearly $1.7 million, and keeping $1.9 million in the bank at the end of last year. He raised $345,000 in the fourth quarter and reported about $30,000 in campaign debts.
Boswell is trailing in the money chase with $666,000 raised in 2011, including $182,000 in the fourth quarter. He reported $494,000 on hand at the end of the year and no debts.
It's not officially a member-versus-member matchup, but it is widely expected that Rep. Jeff Landry (R) will campaign against Rep. Charles Boustany (R) in the state's new 3rd District.
The Republican duo landed in the same district under the state's new congressional map when Louisiana lost one seat in the reapportionment process.
Boustany has indicated he will run in the district; Landry has yet to telegraph his intentions.
According to campaign finance reports, Boustany would have the money edge in a face-off with nearly $1.3 million on hand at the end of 2011. Boustany raised $223,000 in the fourth quarter, giving him a nearly $1.2 million tally for 2011 with no debt.
Landry, who was first elected in 2010, raised nearly $759,000 in 2011, including $190,000 in the final months of the year. He had $534,000 on hand but retains debts of nearly $21,000, including a $20,000 personal loan to his campaign from the previous cycle.
Republican lawmakers in Michigan eliminated Rep. Gary Peters' (D) suburban Detroit district after the state lost yet another congressional seat to reapportionment, prompting him to pick between challenges to senior Democratic Rep. Sander Levin or freshman Rep. Hansen Clarke (D).
Peters opted for the new 14th District, and both lawmakers must also face off in the Democratic primary with Southfield Mayor Brenda Lawrence and former state Rep. Mary Waters.
Peters is ahead in the money chase, raising nearly $1.2 million in 2011, including $286,000 in the fourth quarter. He retained $1 million on hand and had no debts.
Clarke reported raising $490,000 for the year, including $124,000 in the fourth quarter. He retained more than $500,000 on hand and had no debts.
Also losing a congressional seat is the Garden State, where Democratic Reps. Steve Rothman and Bill Pascrell will face off in northern New Jersey's 9th District.
Rothman opted to move into Pascrell's territory after the state's redistricting commission put his home into a GOP-leaning district held by Rep. Scott Garrett (R).
According to their newest campaign finance reports, both Democrats have well over $1 million in the bank.
Rothman reported raising $507,000 in 2011, with $99,000 coming in the fourth quarter. He had $1.7 million on hand at the end of the year and no debt.
Pascrell raised significantly more in 2011, putting nearly $856,000 in his coffers, of which $195,000 came in at the end of the year. He banked slightly less than Rothman but still reported a healthy $1.5 million in the bank with no debt.
Freshman Rep. Jim Renacci (R) will face off with Rep. Betty Sutton (D) after Ohio lost two congressional seats in the decennial reapportionment process.
The Republican-dominated Legislature broke apart Sutton's northeastern 13th District, and she opted to move into the new 16th District, which includes part of Cuyahoga County.
Renacci reported raising $1.2 million in 2011, including $228,000 in the fourth quarter, and retained $957,000 on hand at the end of the year.
But Renacci, among the richest members of Congress according to his personal financial disclosure reports, is still owed $370,000 in personal loans he made to the campaign last cycle.
Sutton reported raising $753,000 in 2011, including $206,000 in the fourth quarter. But Sutton had $433,000 on hand, or less than half as much as Renacci. She reported no debts.
The Ohio remap also prompted a battle between two senior Democrats for the new 9th District bounded on one side by the Lake Erie shoreline. The new district conjoins Rep. Dennis Kucinich's (D) Cleveland home and Rep. Marcy Katpur's (D) Toledo base.
Kaptur brought in $144,000 in the last quarter, more than doubling receipts for the year for a total of nearly $283,000. She retained her cash-on-hand advantage with nearly $707,000 in the bank.
Kucinich, who is expected to tap the national fundraising network he established in his quixotic presidential bids, held a celebrity-studded California fundraiser in the last quarter, according to media reports.
He reported raising nearly $170,000 in the final three months of the year, bringing his year-end total to more than $616,000. But Kucinich had $121,000 on hand.
Neither campaign reported any debts.
The Keystone State lost one congressional seat to reapportionment, resulting in a new map that forces Democratic Reps. Jason Altmire and Mark Critz to face off for the new 12th District.
The new district contains more of Altmire's current territory in the Pittsburgh suburbs but also has Critz's Johnstown-base, which he won in a 2010 special election to replace the late Rep. John Murtha (D).
Altmire reported raising more than $1.1 million in 2011, including $181,000 in the final months of the year. He retained $852,000 on hand with no debts.
Critz trails in the money chase with $869,000 raised in 2011, including $130,000 in the fourth quarter. He reported $465,000 on hand and a small $7,300 debt including a personal loan of $7,000.