Some proceeds from the Dec. 1 event will go to Cassidy ahead of his runoff election.
The GOP might have trouble replicating its success in two years.
The Kentucky Republican is expected to run for both the Senate and presidency.
The GOP is likely to have a 54-seat Senate majority next Congress.
The gun rights group's new ad ties the Louisiana Democrat to President Obama.
Laura Barron-Lopez 11/17/14 08:10 AM EST
The senator, who's facing a tough runoff, pushed for a vote in the Senate.
Laura Barron-Lopez 11/14/14 05:20 PM EST
House Dems are furious their Senate colleagues have hijacked Keystone to save Landrieu.
Chicago Sun-Times reports Ill. Dem is thinking of challenging Sen. Mark Kirk (R).
The GOP challenger has opened up a 16-point lead, poll shows.