Key races to watch across the D.C. region on Election Day

Voters in Maryland, Virginia and the District are heading to the polls Tuesday to cast ballots in races for Congress and local governments and school boards in addition to the presidential election. With control of the U.S. House of Representatives and Senate at stake, both major parties and the political action committees that support their candidates have poured millions of dollars into races in the region where seats are either vulnerable or open after the incumbent chose not to seek reelection.