The republicans count on the following things happening to keep power...Dems have been chomping on the Bit for November for 2 years in most places, the Repug strategy is to suppress the Dem vote. They have no answer for the sheer numbers and they know it.
-3rd party candidates splitting the vote, which allows the republicans to need less votes for victory. If it was just simply Democrats vs Republicans, none of this bullshyt would be happening.
-Young whites not voting.
-Minorities not voting.