Alan Greenblatt is a GOVERNING correspondent.
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Jim DeMint, a Republican U.S. senator from South Carolina, held a news conference yesterday to endorse Marco Rubio, the former Florida House Speaker who is running against Gov. Charlie Crist in next year's Senate race.
Both Florida and national Republicans have lined up behind Crist, seeing him as the strongest candidate to hold the seat for the party. DeMint said that not only is Rubio more conservative, he believes Rubio can win.

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