The Associated Press says Clinton is telling people she's officially dropping out of the race on Saturday, and supporting Obama:

WASHINGTON (AP) — Hillary Rodham Clinton has decided to end her historic presidential campaign while leaving her options open to retain her delegates and promote her issue agenda, a campaign official says.

The former first lady told House Democrats during a private conference call Wednesday that she will express support for Barack Obama’s candidacy and congratulate him for gathering the necessary delegates to be the party’s nominee.

“Senator Clinton will be hosting an event in Washington, D.C., to thank her supporters and express her support for Senator Obama and party unity. This event will be held on Saturday to accommodate more of Senator Clinton’s supporters who want to attend,” her communications director Howard Wolfson said.

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