Then-Sen. Chuck Hagel (R-Nebraska) dressed up as then-Sen. Joe Biden (D-Deleware) for a Senate hearing on Halloween in 2007. Hagel often dressed as his peers for Halloween.
Former White House Press Secretary Robert Gibbs dressed as Darth Vader during a White House reception in 2009.
George W. Bush's top political strategist, Karl Rove, got involved in a camouflage Halloween group costume.
Former California Gov. Arnold Schwarzenegger and actress Jamie Lee Curtis in 2001, several months before he announced his bid for governor of California.
President Obama does not dress up for Halloween in public, though he is not opposed to carrying his own pumpkin. Here he was on October 31, 2008, in Chicago, right before he would win the election.
Then-Vice President Dick Cheney didn't dress up for Halloween in 2007. Instead, he made his dogs Jackson (L) and Dave (R) put on costumes instead.