From CNN:

Nebraska Sen. Ben Nelson announced Friday that he would be supporting the motion to proceed that would allow the Senate to begin debate on the Democrats’ health care reform legislation.
“Throughout my Senate career I have consistently rejected efforts to obstruct,” he said in a statement. “That’s what the vote on the motion to proceed is all about. It is not for or against the new Senate health care bill released Wednesday. It is only to begin debate and an opportunity to make improvements. If you don’t like a bill why block your own opportunity to amend it?”