Few incumbent senators have lost bids for their parties’ nomination over the last 60 years, making Sen. Richard Lugar’s (R-Ind.) loss all the more newsworthy. We look at Lugar and nine senators whose losses surprised us the most.
Sen. Kenneth McKellar (D-Tenn.) McKellar lost to former vice president Al Gore's father, Albert Gore Sr., in a 1952 primary after six terms in the Senate. /AP Buy Photo