Joe Biden Denounces Hyde Amendment, Reversing His Position

After two days of intense criticism, Joseph R. Biden Jr. reversed himself Thursday night on one of the issues most important to Democratic voters, saying he no longer supports a measure that bans federal funding for most abortions.

As recently as Wednesday, Mr. Biden’s campaign had said he supported the measure, known as the Hyde Amendment. His decision to change positions illustrates the intense pressure he faces as the presumed front-runner for the Democratic nomination for president.

His turnaround was abrupt, particularly because Mr. Biden has grappled for decades with...