If primaries and caucus victories are still all about media attention and momentum, then, yes, it's critical who wins Michigan's statewide vote Tuesday. All the more so if that winner is not Mitt Romney, who grew up there and whose dad was governor in the 1960s.
But as to collecting actual delegates for the actual GOP nomination? Tuesday's vote in Michigan probably will not matter much at all.
Rick Santorum is trying to shake up the Republican primary by winning the primary Tuesday in Michigan — and many polls show him neck and neck with Mitt Romney. He's a former senator from Pennsylvania best known as a culture warrior. What's less well known is what he did after losing his re-election bid in 2006.