Alan Greenblatt is a GOVERNING correspondent.
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Florida Gov. Charlie Crist will announce tomorrow that he is running for the U.S. Senate, raising Republican expectations of holding onto that seat.
As this Politico post notes, Crist will have to overcome conservative skepticism as expressed by the candidacy of former state House Speaker Marco Rubio. Crist will immediately garner most of the party endorsements worth having, however, with speculation centering on which way former Gov. Jeb Bush will throw his weight.

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