FILE - In this Thursday, Oct. 25, 2012, file photo, Republican Tom Cotton, left, participates in a debate at Arkansas Educational Television Network studios in Conway, Ark. Arkansas Re

 

              FILE - In this Thursday, Oct. 25, 2012,  file photo, Republican Tom Cotton, left, participates in a debate at Arkansas Educational Television Network studios in Conway, Ark. Arkansas Re
FILE - In this Thursday, Oct. 25, 2012, file photo, Republican Tom Cotton, left, participates in a debate at Arkansas Educational Television Network studios in Conway, Ark. Arkansas Republican Rep. Tom Cotton plans to announce his bid to challenge two-term incumbent Democratic Sen. Mark Pryor in next year’s elections, according to a person familiar with the congressman’s plans on Wednesday, July 31, 2013. (AP Photo/Danny Johnston)