Nevada: Congressional District 2

RENO -- Filing done, the top races in the state have come into focus and politics-watchers have a lot to look forward to this season.

Reeling from three consecutive special election losses, congressional Republicans will have their hands full holding on to the 3rd congressional district and, in a watershed year, the 2nd. Control of the state Senate rests on the thinnest of one-seat majorities, and the Democrats' coveted "veto-proof" majority is only one pick-up away. Here's a brief rundown of the races to watch and how they could all play out: