The end of a political campaign does not mean the end of a super PAC. In fact, candidates who pull out of a race have no claim to the unused cash, and PAC staffers can use this so-called zombie money however they want after the candidate drops out.

Nevada's unionized workforce could play a huge role in deciding who wins the swing state come November. Professor Ruben Garcia discusses Nevada's union landscape.

Armed with a smartphone and a special app from Square, fundraisers can collect credit card donations on the spot.

The flap over debate audience reactions raises questions about who picks them, who is really in control of them and whether they can affect voters' choices at the polls.