Missouri is the site of one of the nation's most competitive Senate races. Sen. Claire McCaskill, who represents that state, which voted for Trump by almost 19 points, is one of the most vulnerable Democrats up in 2018. She faces Republican state Attorney General Josh Hawley in a race that both sides are focusing on for control of the upper chamber. Democrats have attacked Hawley's record as attorney general and focused on health care, while Republicans have criticized McCaskill for voting against the Republican tax bill and using a private plane to get around the state. McCaskill won re-election in 2012, when Obama lost Missouri by 10 points, but the state has moved to the right since then. Whatever the outcome, this could be one of the closest races in the country, and it could keep results-watchers up late, as heavily Democratic St. Louis County traditionally is late to announce its results.
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