President Barack Obama walks to the Cannon Caucus Room with Speaker Nancy Pelosi, D-Calif., to meet with House Democrats about health care on Capitol Hill in Washington, Saturday, Nov. 7, 2009.(AP Photo/Alex Brandon)AP – President Barack Obama summoned Democrats to “answer the call of history” Saturday as the House pushed toward a vote on a landmark health care bill holding out the promise of coverage for tens of millions who lack it.