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Most Important Number: 4
The majority of Senate seats up for grabs are from Republican incumbent states. Steve Kornacki explains why four is the magic number for Democrats.
Battle for House and Senate
Battle in Bayou03:22
How will 2014 impact 2016?07:23
New voter ID laws could spread02:57
Priebus: People are angry, US in a ditch04:03
Ground game instrumental in voting08:33
Races to watch in Ky., NC, Texas and Colo.04:52