Rep. Darrell Issa's younger years did not foreshadow success: A high school dropout, he was twice charged with car theft and once convicted for the possession of an unregistered handgun. But the California Republican went on to enter the Army, earn his college degree and start a car alarm company that has made him a multimillionaire. Ambitious, articulate and polished, Issa has become a forceful critic of the Obama administration as the top Republican on the House Oversight and Government Reform Committee. And come next week -- if Republicans win the House in the midterm elections, as expected -- he will become the presumptive chairman of the powerful oversight panel. After more than a decade in politics, Issa is on the verge of becoming a well-known thorn in President Obama's side.