It seems the Speaker of the House and the Majority Whip are having some difficulty finding enough Democratic members of Congress to vote for their health care bill.
From The Hill:
Speaker Nancy Pelosi (D-Calif.) has expressed confidence she has the votes, while Majority Whip James Clyburn (D-S.C.) acknowledged there is still work to do.
In other words, the Majority Whip still has some arm-twisting and vote-buying to do.