Colorado, Minnesota and Missouri: What to watch for

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum greets supporters after a campaign stop in Colorado Springs, Colo., Tuesday, Feb. 7, 2012. (AP Photo/Chris Carlson)

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum greets supporters after a campaign stop in Colorado Springs, Colo., Tuesday, Feb. 7, 2012. (AP Photo/Chris Carlson)

The Washington Post has a nice primer for events happening today related to the GOP presidential nomination process.

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