"The concern among Democrats ... is that there are more yes votes reconsidering than no votes"

“I think we can do better,” Mr. Cardoza said of the president’s proposal.

Representative Frank Kratovil Jr., Democrat of Maryland, is also unconvinced. He voted against the House bill on the grounds that it is too big and too costly — a view that some constituents in his Republican-leaning district share. In case he did not get the message, one of them hanged him in effigy this past summer outside his district office on Maryland’s Eastern Shore.

“This system is broken; we have to do something,” Mr. Kratovil said. “But my preference would be to do smaller things.”…

Others, like Representative Jason Altmire, a Pennsylvania Democrat who also voted against the House bill, seem to wonder aloud why Mr. Obama is bothering. With so many Democrats feeling nervous about their past votes in favor of the health bill, Mr. Altmire said, he can imagine vote-switching in only one direction: from yes to no.

“I don’t know of any no votes at this point that would switch unless the bill is substantially changed, including me,” he said. “And I know of a handful of yes votes who regret it and would relish the opportunity to put a no vote on the board so they could go back home and talk about that.”