The Republican bench in Colorado got a bit thinner this weekend. Former acting state treasurer and Senate Majority Leader Mark Hillman has decided he won't run for office next year, Mike Saccone reports Sunday in Political Notebook. “Just wanted to give you a heads up that I’ve begun telling my closest friends and best supporters that I will NOT be running for office in 2010," Hillman wrote in an e-mail to the Grand Junction Daily Sentinel political reporter.