Mark Pryor

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Rep. Tom Cotton, R-Ark. waves at his election watch party in North Little Rock, Ark., after defeating Sen. Mark Pryor, D-Ark., Tuesday, Nov. 4, 2014. (AP Photo/Danny Johnston)

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U.S. Sen. Mark Pryor, D-Ark., arrives at a rally for campaign volunteers Saturday, Sept. 13, 2014, in Little Rock, Ark. Pryor will face Republican challenger U.S. Rep. Tom Cotton in the November election. (AP Photo/Danny Johnston)

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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U.S. Sen. Mark Pryor participates in a discussion about increasins college costs and student loans in Little Rock, Ark., Thursday, May29, 2014. (AP Photo/Danny Johnston)

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U.S. Sen. Cory Booker, D-N.J., left, walks from the Arkansas state Capitol with U.S. Sen. Mark Pryor, D-Ark., after a news conference in Little Rock, Ark., Saturday, May 31, 2014. Booker on Saturday accused Pryor’s Republican rival of going against a bipartisan tradition by opposing disaster aid for the states hit by Superstorm Sandy. (AP Photo/Danny Johnston)

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U.S. Sen. Cory Booker, D-N.J., right, listens as U.S. Sen. Mark Pryor speaks during a news conference at the Arkansas state Capitol in Little Rock, Ark., Saturday, May 31, 2014. Booker on Saturday accused Pryor’s Republican rival of going against a bipartisan tradition by opposing disaster aid for the states hit by Superstorm Sandy. (AP Photo/Danny Johnston)

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U.S. Sen. Mark Pryor, D-Ark., left, speaks during a news conference at the Arkansas state Capitol as U.S. Sen. Cory Booker, D-N.J. listens in Little Rock, Ark., Saturday, May 31, 2014. Booker on Saturday accused Pryor’s Republican rival of going against a bipartisan tradition by opposing disaster aid for the states hit by Superstorm Sandy. (AP Photo/Danny Johnston)

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U.S. Sen. Cory Booker, D-N.J., right, speaks during a news conference at the Arkansas state Capitol in Little Rock, Ark., as U.S. Sen. Mark Pryor listens Saturday, May 31, 2014. Booker on Saturday accused Pryor’s Republican rival of going against a bipartisan tradition by opposing disaster aid for the states hit by Superstorm Sandy. (AP Photo/Danny Johnston)

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U.S. Sen. Mark Pryor speaks about student college loan issues in Little Rock, Ark., Thursday, May 29, 2014. (AP Photo/Danny Johnston)

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U.S. Sen. Mark Pryor, left, speaks to college students about student loan issues in Little Rock, Ark., Thursday, May29, 2014. (AP Photo/Danny Johnston)