This is a kind of funny article about how Harry Reid momentarily put his bill in jeopardy:

It was the pinnacle moment of his political career. The majority leader of the United States Senate, Harry Reid of Nevada, on the verge of making history by shepherding through landmark health care legislation, was called upon by the clerk to cast his vote.

And Mr. Reid, who has fought, night and day, nail and tooth, for months to get the health care bill adopted, looked up from his desk and said: “No.”
For a millisecond there was silence in the chamber. Had he lost it? Was he joking?

Within half a second, Mr. Reid had switched his vote to “yes.”