Dan Bongino ran for the Senate in Maryland in 2012 against incumbent Ben Cardin, in what everyone recognized to be a long shot in blue Maryland in a presidential election year.

Bongino, a political unknown who formerly was a Secret Service agent in the Presidential Protection Division, made a very respectable showing...

Here we go.

Saxby Chambliss will not be running for reelection in 2014:

Georgia Sen. Saxby Chambliss said Friday he will not seek a third term next  year, expressing deep frustration with Washington gridlock that he doesn’t see  changing in a divided government.

Chambliss, 69, rejected suggestions he couldn’t have survived a likely GOP ...

But I’m already sizing up Operation Counterweight Senate races for 2014.

Don’t look back is my motto.

Roll Call has a list of Senate races and assessments.   Do any of them have serious primary challengers?  Lindsay Graham seems like he could be vulnerable in theory, but I wonder if in practice.  Susan Collins...