10. Harry Reid
Current Senate Minority Leader, Harry Reid has been serving for Nevada since 1987. While he was previously the Majority Leader, he lost the title when the Republicans gained control of the Senate in 2014. Due to injuries and other health issues, Reid has gone on the record that he will be retiring on January 3, 2017. Currently, two Republicans have declared they are officially running for Reid’s seat: Eddie Hamilton and Joe Heck. It should be interesting to see if the Republicans can nab a win in a state that tends to lean to the left.