Michigan results here; Arizona’s, here.  The polls close in Arizona at 9 or 10 PM EST, depending.

[UPDATE]: Hot Air was mildly startled by the relatively quick flip earlier from Santorum to Romney in Michigan.  What happened was that Oakland, Wayne and Macomb counties (which I think are the three largest) started reporting in earnest; and all three counties are looking to be going for Romney in a fairly strong way.  I’m not calling it for Romney, but with 22% in I don’t think that Santorum is going to get the upset in Michigan.