As lawmakers wage ideological war over government spending and Obamacare, Zach Kouwe's big plan for a national park wedding hangs in the balance. In addition to turning away an estimated 750,000 national park visitors a day, this week's government shutdown -- the first since 1996 -- could derail scores of weddings from Yosemite to the Great Smoky Mountains, Shenandoah and the National Mall.