It use to be 41 for Freedom that was a long time ago.
Interesting that 9 of this 41 will be up for reelection in 2016. X marks the spot on the nine vulnerable of the ten Dims up for election:
Michael Bennet (Colorado)
Richard Blumenthal (Connecticut)x
Barbara Boxer (California)x
Patrick Leahy (Vermont)x
Barbara Mikulski (Maryland)x
Patty Murray (Washington)x
Harry Reid (Nevada)x
Brian Schatz (Hawaii)x
Charles Schumer (New York)x
Ron Wyden (Oregon)x
The campaign will write itself. Voted against the Keystone Pipeline.