Source Of $1.5 Million Donation To GOP Senate Candidate May Never Be Revealed

Source Of $1.5 Million Donation To GOP Senate Candidate May Never Be Revealed
U.S. Rep. Tom Cotton, R-Ark., speaks to the annual meeting of Arkansas Independent Colleges and Universities in Little Rock, Ark., Friday, Nov. 1, 2013. (AP Photo/Danny Johnston)
U.S. Rep. Tom Cotton, R-Ark., speaks to the annual meeting of Arkansas Independent Colleges and Universities in Little Rock, Ark., Friday, Nov. 1, 2013. (AP Photo/Danny Johnston)

Arkansas is witnessing what may be the most expensive political ad campaign in state history: $1.5 million-worth of glowing TV spots hailing Tom Cotton, a Republican congressman who's running against Democrat Sen. Mark Pryor.

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