Senator Evan Bayh (D-IN) says bill "at end of day it may be just imperfect."

"We want to cover the uninsured, yes, but we don't want to do it in a way that's going to drive up the costs for folks who currently have it," said Senator Evan Bayh, one of a number of centrist Democrats whose support will be crucial to pass the overhaul in the face of solid Republican opposition.

"I don't think we can afford to do nothing with costs going up 10, 15 percent a year," Bayh said. "My objective is to try and make that alternative of doing something as positive as we possibly can, realizing that -- at the end of the day it may be just imperfect."