Missouri voters have until 7 p.m. to cast their Election 2012 ballots, but voting in other key swing states ends hours before then, and exit polling could provide an early indication of whether President Barack Obama or Mitt Romney wins the White House.
The earliest key state to watch for is Virginia, where polls close at 6 p.m. St. Louis time.
Voting ends 30 minutes later in swing states Ohio and North Carolina. At 7 p.m. St. Louis time, swing states Florida, Pennsylvania and New Hampshire close their polls. Wisconsin polls close at 8 p.m. St. Louis time.
Nevada, the final swing state that could prove as pivotal as Iowa, also closes its voting at 9 p.m. St. Louis time.
Check here as Patch updates Election 2012 results as they come in.