A look at the midterm races that remain undecided

As Democrats prepare to take control of Congress and Republicans grapple with stunning losses, every remaining race matters. Some races are still too close to call, including Senate battles in both Alaska and Mississippi. Congressional correspondent Lisa Desjardins reports.

As Democrats prepare to take control of Congress and Republicans grapple with stunning losses, every remaining race matters. Some races are still too close to call, including Senate battles in both Alaska and Mississippi. Congressional correspondent Lisa Desjardins reports.