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.
Host Rachel Martin speaks with Nate Silver, who writes the FiveThirtyEight blog for The New York Times, about the mechanics of the GOP primary, the number of delegates apportioned so far and how future contests will determine the delegate count.
Syrians vote on a new draft constitution Sunday, though the opposition has called for a boycott. Violence has been reported across the country. Host Rachel Martin talks with NPR's Peter Kenyon about the latest on the bombardment of Homs and other developments in Syria.