In Michigan, incumbent Republican squish Joe Schwarz is facing a challenge from Club for Growth-backed conservative Tim Walberg, and could very well lose. Official results from that race will appear here. CfG also has a dog Colorado’s 5th district, where they back Doug Lamborn in the Republican primary. (I can’t find a results link for that one at the moment, but I’ll add one if I can.) UPDATE: Here’s a link that’ll have results for CO-5 (as well as the contested Democratic primary in CO-7).
