Americans are poised to elect a new Congress as every seat in the House of Representatives and one-third of the Senate is up before voters on Election Day.

You can't miss their ads on T.V. and radio. Candidates for a handful of congressional seats seem to be dominating the airwaves in recent weeks. Here's a closer look on why so much money is being spent on so few races.

Fox News senior congressional correspondent Chad Pergram on the key swing House races to pay attention to on election night.