<P> Incumbent Democratic Senator Claire McCaskill is running for re-election to a third term . </P> <P> Located at the crossroads of the Midwest, the South, and the Great Plains, Missouri was long a swing state with a compelling record of predicting the presidential winner . However, with Barack Obama's razor thin defeat in 2008, the state began a rightward trek . In 2016, President Donald Trump won it by almost 20 points . </P> <P> Incumbent Democrat Claire McCaskill is running for reelection, but is seen by many pundits as a vulnerable incumbent, as only 46% of her constituents approve of the job she is doing in the United States Senate . McCaskill's slightly unpopularity and the Show Me State's reddening landscape have given Republicans cautious optimism, despite McCaskill's double digit victory in 2012 . Missouri Attorney General Josh Hawley is seen as a favorite to challenge her by many GOP donors . </P> <Ul> <Li> Angelica Earl, former insurance verification specialist </Li> <Li> Claire McCaskill, incumbent U.S. Senator </Li> </Ul>

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