*UPDATE 4:58 PM ET*
The Associated Press declared Republican Dave McCormick unseated Democrat Bob Casey in the Pennsylvania senate race.
But Casey refuses to concede.
McCormick leads 49% to 48.5%.
Pennsylvania does an automatic recount if the margin is 0.5% or below.
The Republicans retook the Senate, but the Democrats held Michigan and Wisconsin.
Pennsylvania is a different story.
Republican Dave McCormick is ahead of incumbent Democrat Bob Casey, 48.94% to 48.5%, with 98% of the votes in.
If McCormick maintains his 0.4% lead, an automatic recount would occur.
Pennsylvania performs a recount in any statewide race if the margin is 0.5% or less.
It looks like the Democrats will also hold Nevada.
Incumbent Democrat Jacky Rosen pulled ahead of war hero Republican Sam Brown last night.
She leads 47.6% to 46.7%.
The Las Vegas Sun reported that officials must “verify an additional 12,757 mail ballots with signatures that did not match file samples or were missing.”
In Michigan, Democrat Elissa Slotkin defeated Republican Mike Rogers 48.62% to 48.62%.
In Wisconsin, incumbent Democrat Tammy Baldwin squeaked past Republican Eric Hovde, 49.38% to 48.52%.
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