Senate Democratic leaders departed the White House on Thursday evening after a meeting with President Barack Obama that was expected to delve into the effort to combine Senate health care reform bills. The group left without comment.Included in the session were Majority Leader Harry Reid (Nev.), Senate Majority Whip Dick Durbin (Ill.), and Sens. Patty Murray (Wash.) and Charles Schumer (N.Y.).White House officials were not immediately available for comment.