A Palm Beach County election worker counts ballots in Riviera Beach, Fla., on Nov. 9. Rep. Allen West contested the results of the election in Florida's 18th District for two weeks before conceding. Since 2000, the number of contested elections has more than doubled. J Pat Carter/AP hide caption

itoggle caption J Pat Carter/AP

U.S. Communists have been running for office for decades. Above, the Party's presidential ticket in 1936. Ken Rudin collection hide caption

itoggle caption Ken Rudin collection