President Obama's health care summit with Republicans and Democrats will take center stage Thursday. But the compromise most of Washington is focused on will come post-summit: Before Democrats can turn to a parliamentary maneuver to pass health legislation, they must resolve disputes within their own ranks. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Massachusetts Gov. Deval Patrick looks on as President Obama speaks at a Boston fundraiser for the governor in October 2009. Gerald Herbert/AP Photo hide caption

itoggle caption Gerald Herbert/AP Photo

Budget Office Director Peter Orszag (far right) has found a way to turn walking into a competitive sport on Capitol Hill. Here, he walks through the Eisenhower Executive Office Building with Vice President Biden, President Obama and Treasury Secretary Timothy Geithner. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP