Colorado Gov. John Hickenlooper and U.S. Sen. Mark Udall sent a letter to the National Park Service this week asking the federal agency to reconsider its rejection of the Colorado National Monument near Grand Junction as a stage venue for this summer’s Quiznos Pro Challenge cycling race. The 600-mile stage race is the brainchild of cycling legend Lance Armstrong and former Gov. Bill Ritter. Armstrong Tuesday officially retired from professional cycling even as he continues to deal with an ongoing doping investigation looking into the past behavior of the seven-time Tour de France winner.