The feud between Sens. Barbara Boxer, D-Calif., and David Vitter, R-La., doesn't have the import of the federal government shutdown, but it does shine a light on the Beltway's partisan rancor. If there is a lesson for Washington politicos from this mud fight, then it is this: Don't try to be clever. There will be blowback. The story begins when Democrats were pushing President Barack Obama's Affordable Care Act. Sen. Charles Grassley, R-Iowa, inserted language into the bill to require that Congress and staff get their health insurance through Obamacare exchanges. Grassley's amendment didn't explicitly address the government's contribution --...