It's a solution without a problem

The Senate Finance Committee Democrats rejected a proposal which required that immigrants prove their identity with photo identification when signing up for federal healthcare programs. Chuck Grassley (R-Iowa) said that current law and the healthcare bill under consideration are too lax and leave the door open to illegal immigrants defrauding the government using false or stolen identities to obtain benefits.

Democratic Sen. Jeff Bingaman, New Mexico, disagrees. He thinks that the type of fraud Grassley said he wants to prevent is highly uncommon. "The way I see the amendment, it's a solution without a problem," Bingaman said.

If it's highly uncommon then why not agree to it? You calm a fear and perhaps get more votes for the total bill, all in exchange for agreeing to something that isn't a problem in the first place.