** FILE ** Colorado Gov. John Hickenlooper, left, confers with Steve Hogan, mayor of Aurora, Colo., before a news conference at the Century 16 theater east of the Aurora Mall in Aurora, Colo., on Friday, July 20, 2012. (AP Photo/David Zalubowski)
Colorado Democratic gubernatorial candidate John Hickenlooper (left) has thus far refrained from going negative against his chief rival, American Constitution Party candidate Tom Tancredo (right), in his campaign ads. (Associated Press)
ASSOCIATED PRESS
Former U.S. Rep. Tom Tancredo (left) debates the issues earlier this month with the other major Colorado gubernatorial candidates, Republican Dan Maes (center) and Democrat John Hickenlooper. Mr. Tancredo got the go-ahead Tuesday to run on the American Constitution Party ticket.