Polls: Romney leads by two in Michigan, by 16 in Arizona

In Michigan, Santorum leads Romney among self-identified Tea Party supporters, 48 to 29 percent, and those who describe themselves as “very conservative,” 59 to 20 percent.

Yet among those who don’t support the Tea Party, Romney is ahead by more than 20 points, 45 to 24 percent.

And among those who have already voted absentee in Michigan – 16 percent of likely GOP voters – Romney leads Santorum, 49 to 26 percent.