She’ll privately tell all of her closest advisors and supporters about her plans on Friday, and then hold a public rally the following day.

From NY Times:

Senator Hillary Rodham Clinton will endorse Senator Barack Obama on Saturday, bringing a close to her campaign for the White House, aides said. Her decision came after Democrats urged her Wednesday to leave the race and allow the party to coalesce around Mr. Obama. (Full article by Adam Nagourney and Jeff Zeleny here.)

Mrs. Clinton’s aides said she would “express her support for Senator Obama and party unity” at an event in Washington, D.C., that day. One adviser said that Mrs. Clinton would concede defeat, congratulate Mr. Obama and proclaim him the party’s nominee, while pledging to do what was needed to assure his victory.

Her decision came after a day of conversations with supporters on Capitol Hill about her future now that Mr. Obama had clinched the nomination. Mrs. Clinton had, in a speech after Tuesday night’s primaries, suggested she wanted to wait before deciding about her future, but in conversations throughout the day Wednesday, her aides said, she was urged to step aside.

If she had given a different speech last night, if Terry McAuliffe hadn’t introduced her as the “next President of the United States,” maybe party leaders would have given her a little bit more time. But that didn’t happen, and I really do think she blew her one opportunity to have any leverage.

More as it develops…

Politics Confirmed: Clinton To Publicly End Campaign On Saturday