It's Election Day and we're taking a look at the key races driving voters to the polls. In the House of Representatives, all 435 seats are up for grabs and Democrats are hoping to flip at least 23 Republican-held seats to regain the majority. This year, 35 Senate seats are in play with pollsters expecting close races in Missouri and Nevada. Several states will also elect new governors, which could lead to the reshaping of congressional districts. Forum discusses the nation's most anticipated races and sheds some light on how to make sense of tonight's exit polls.