Sen. Mark Pryor of Arkansas, the son of former Arkansas governor and U.S. senator from Arkansas David Hampton Pryor, won his seat in 2001 and was re-elected in 2008 with no Republican opposition. This time he's facing a challenge from one of the Republican Party's rising stars — Rep. Tom Cotton, 37, an Army veteran elected to the represent Arkansas' 4th District in 2012. (Associated Press)
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