Summary: Missouri's Democratic Sen. Claire McCaskill is making a bid for a third term in a state that's become increasingly red, setting up a nationally watched showdown that could prove key to which party controls the U.S. Senate.
Summary: Missouri's Democratic Sen. Claire McCaskill is making a bid for a third term in a state that's become increasingly red, setting up a nationally watched showdown that could prove key to which party controls the U.S. Senate.