The Denver Post suggests why:
Not only does the national political environment still show voter dissatisfaction with Republicans, but GOP backers have paused at some of McInnis' past political decisions and current status as a lobbyist.
Additionally, former Sen. Bill Armstrong, known as the "godfather" of the state GOP, isn't backing him, and has thrown his support behind former U.S. Rep. Bob Schaffer - who hasn't decided whether he is running.
It also doesn't help McInnis that new CO-GOP Chair Dick Wadhams has such a close personal relationship with former Rep. Bob Schaffer.
http://senate2008guru.blogspot.com/