Republicans hope to win control of the U.S. Senate from Democrats in November, and one seat they have high hopes for is in Missouri.
Democratic incumbent Claire McCaskill is facing a tough re-election fight. Outside conservative groups have already been running ads against her. On Tuesday, Republicans will select their candidate for the fall.
Enlarge Brian Naylor/NPR
Former Missouri State Treasurer Sarah Steelman has earned the endorsement of Sarah Palin in her bid for a Republican Senate nomination.
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