O'Malley is slated to endorse the New York senator today
at an event in Annapolis, two officials said Tuesday.
They spoke on condition on anonymity in advance of the
formal announcement.
Spitzer plans to make his endorsement Monday in Albany,
N.Y. The event is expected to draw a host of other New
York Democrats, including state Attorney General Andrew
Cuomo and Lt. Gov. David Paterson.
For months, Spitzer has hedged about an endorsement of
Clinton, who leads national polls for the Democratic
nomination. But the governor had dropped enough hints
that the endorsement really came down to a guessing game
about when - not if - it would happen.
"New Yorkers know firsthand how effective Hillary is as
a leader, which is why her support runs deep in this
state," Spitzer said Tuesday.
The praise from O'Malley in recent weeks was similar .
"I think she'd make a great president of the United
States," O'Malley said in an interview on Washington
Post radio in March.
Several governors have endorsed candidates in the 2008
race. Clinton also has the backing of New Jersey Gov.
Jon Corzine. Her rival, Sen. Barack Obama, D-Ill., has
the support of Virginia Gov. Tim Kaine and Illinois Gov.
Rod Blagojevich.