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While the number of delegates at stake are roughly the same for both states, Michigan is more closely watched because the second place finisher will garner some of the delegates, and the results are also seen as a referendum on Romney’s candidacy.

Full Michigan results
Michigan exit poll

With Gingrich essentially ceding the state and Paul trailing in in the state, the Michigan primary serves as a test as to whether Republican primary voters are prefer a polished, diligent candidate like Romney or a passionate populist like Santorum.

CBS News early exit polling shows that Arizona and Michigan primary voters are primarily concerned with picking a candidate that can defeat President Obama. Among the issues they care about, voters said the economy is the most important.

When it comes to electability and handling the economy, exit polling shows Michigan voters have the most faith in Romney. Among those voters primarily concerned with defeating Mr. Obama, 61 percent backed Romney, while just 24 percent voted for Santorum. Eight percent voted for Gingrich, and 4 percent voted for Paul.

Full Arizona results
Arizona exit poll

Among Michigan voters who picked the economy as their top issue, 45 percent backed Romney, while 29 percent supported Santorum.

Among Arizona voters who picked the economy as their top issue, 47 percent backed Romney,exit polling showed, while 28 percent backed Santorum. Romney is seen as most electable in Arizona.