Colorado’s Senate race is trending Republican, as the most recent poll, by Fox News, shows Cory Gardner leading Mark Udall by six points. Udall has run a lackluster campaign dominated by a tired, over-the-top “war on women” theme, and this morning the Denver Post, not known as a bastion of Republicanism, endorsed Gardner. Still, the race is competitive on paper. So why has Harry Reid’s Senate Majority PAC just cancelled $289,000 worth of broadcast ads?