Shelley Berkley running for Senate

(Marlene Karas / FOR THE WASHINGTON POST)

Now that she’s in the race, other Democrats who were considering bids will probably take a pass.

Jon Ralston sees Obama winning Nevada

Nevada's top political analyst predicts Obama win win Nevada

Crossroads groups launch six state Senate blitz

(Marlene Karas / FOR THE WASHINGTON POST)

Two groups hit six states.

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Nevada Election Results 2012: Heller wins Senate seat; Horsford tops Tarkanian to become Nevada’s first black congressman

Polls show Obama up in N.H., close races in Nevada and North Carolina

The new NBC/Marist College polls suggest some swing states haven't trended toward Obama in recent weeks.