RACHEL MARTIN, HOST:
This is WEEKEND EDITION, from NPR News. I'm Rachel Martin.
The Republican race for president heads to Michigan and Arizona this week. Both states hold primaries on Tuesday. Former Governor Mitt Romney was in Michigan yesterday, his campaign bus logging more than 250 miles across the state. He's fighting the recent surge of former Senator Rick Santorum.
Romney held three events in three towns - Lansing, Troy and Flint - and NPR's Ari Shapiro was with him at all three stops.