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Perry excited the race for the Republican nomination for president earlier in the day and urged his supporters to vote for Newt Gingrich, renewing his commitment to fight for the conservative cause.

Palin earlier in the week told Fox News that if she voted in South Carolina, she would vote for Gingrich "in order to keep this thing going." 

She said "iron sharpens iron," suggesting Gingrich is a good challenge for front-runner Mitt Romney.

South Carolina votes on Saturday.