For the second day in a row, moderates lobbed eleventh-hour health-care bills onto the floor of Congress, undermining the proposal that has the support of President Clinton. Even as the President sent members of his Cabinet to Capitol Hill to shore up support for Senate majority leader George Mitchell's bill, centrist Senators announced plans to introduce a stripped-down, bipartisan bill that would not increase taxes or require that employers pay for workers' insurance. Just yesterday a group of House members introduced an even milder bill that would leave 26 million people uninsured. TIME Washington correspondent Dick Thompson says few players in Washington have any clue what might happen in the swirl. But he says the embattled Mitchell may force an early vote on employer mandates, as soon as tomorrow.