Chris Simcox of the anti-illegal-immigration Minutemen Civilian Defense Corps has announced he will challenge John McCain in Arizona’s Republican primary in 2010. Both Jim Kolbe and Jeff Flake have beaten back serious primary challenges from restrictionist Republicans in recent election cycles, and Simcox comes with his own controversies. But the Minuteman also has a national fundraising base and a hot-button issue on which McCain is very vulnerable with the Republican base.
