It’s sad that this is a notable occurrence:

A surprise last-minute defection by an Ohio Republican forced the Senate Foreign Relations Committee to postpone a vote that had been scheduled for Tuesday on the nomination of John R. Bolton as ambassador to the United Nations.

…Until the defection, by Senator George V. Voinovich of Ohio, the panel had appeared prepared to send the nomination to the Senate floor on a strict party-line vote. But Mr. Voinovich stunned other senators by announcing that more time was needed to explore accusations against Mr. Bolton.

“My conscience got me,” he said after the stormy two-hour session. He said he had gone to the meeting planning to vote for Mr. Bolton, but changed his mind after hearing the case against the nominee made by Senators Joseph R. Biden Jr. of Delaware and Christopher J. Dodd of Connecticut, both Democrats.

“I wanted more information about this individual, and I didn’t feel comfortable voting for him,” Mr. Voinovich said.

…The second Republican, Lincoln Chafee of Rhode Island, did not make his views known at the hearing, but told reporters later that he was glad that the vote had been postponed.

“I don’t know if I’ve ever seen, in a setting like this, a senator changing his mind as a result of what other senators said,” Mr. Chafee said. “The process worked. It’s kind of refreshing.”