Everyone likes a winner. After Rick Santorum's three-state sweep in Missouri, Minnesota and Colorado on Feb 7, it seems Michigan voters sat up and took notice.
The momentum he gained began to show in Michigan poll numbers on Monday, February 13.
According to Real Clear Politics, on that day, Santorum's poll numbers jumped eight percentage points, going from 14 percent on February 12 to 23.7 percent on February 13.
His numbers continued to rise until they peaked on February 15 at 37.8 percent, while Romney's were at 28.5 percent.
From that day forward the political horse race was on.
Both Santorum and Romney began to campaign heavily in Michigan, and their Super PACs were right alongside.
A week later, Romney closed the gap. We'll see tonight whether it was enough for the presumed front runner.
From the graph above, it looks like support for Newt Gingrich fell around the same time support for Rick Santorum grew. That drop in the polls is why we're not seeing much of Mr. Gingrich in Michigan.