The field of Democrats vying to challenge U.S. Sen. Cory Gardner has winnowed since former Gov. John Hickenlooper entered the race last month, but a Denver businesswoman thinks there’s room for one more person in the primary: herself. Denise Burgess, who serves on the board of the Denver Metro Chamber of Commerce, is announcing her entry into the race Monday morning, taking the number of candidates back up to 10. “Me running for U.S.