The race for the Senate has moved from off-the-radar a year ago to a dramatic, hard-to-predict finish where Democrats stand a chance of retaking the chamber. The contest will come down to just over a dozen races across the country. Lisa Desjardins takes a look at the map and what might happen.

Campaigns and their allies are making their closing arguments, and they've spent more than the annual budgets of a handful of states doing it. Much of that money is aimed at voters' wallets, but the attacks are also getting more personal and more artificial. Lisa Desjardins explains.