UPDATE #3: FOX 31's Eli Stokols:
State Rep. Tim Dore, R-Elizabeth, confirmed Monday that he was still thinking about a run; and Rep. Frank McNulty, R-Highlands Ranch, is rumored to be weighing a campaign in the Fourth C.D., which now includes a good chunk of his home turf in Douglas County, although another GOP lawmaker in the House told FOX31 Denver Monday that a McNulty run was doubtful.
And former state Rep. B.J. Nikkel, R-Loveland, is also still weighing a bid.
Nikkel, who in 2012 was the first Republican lawmaker to vote in favor of a civil unions bill, would be able to self-fund a campaign in the early stages; and, as a woman who is politically moderate, she might draw financial support from national GOP organizations and committees.
UPDATE #2: Add another potentially big Republican name to the list considering a challenge to the not-so-inevitable Ken Buck in CD-4–former state Rep. B.J. Nikkel, who served as district director under Marilyn Musgrave, is seriously considering jumping in the race according to sources.
UPDATE: Via Lynn Bartels, count Weld County Commissioner Barbara Kirkmeyer in:
Weld County Commissioner Barbara Kirkmeyer joins 4th CD GOP race. #copolitics
— Lynn Bartels (@lynn_bartels) March 3, 2014
Republican Sen. Scott Renfroe confirmed over the weekend that he is going to run for Congress in CD-4, joining Ken Buck in a field that is only likely to grow in the coming weeks.
Rumor has it that former House Speaker Frank McNulty is also preparing to enter the GOP field for the seat being vacated by Rep. Cory Gardner. We'll update more as news develops–and we've got a feeling it will.