Rick Santorum won both GOP primaries in the South yesterday. He took 35 percent of the vote in Alabama and 33 percent in Mississippi. Do these results spell the end of the road for Newt Gingrich? And what does this mean for Tuesday's third-place winner, delegate leader Mitt Romney?
Todd Zwillich is The Takeaway's Washington correspondent. Kate Kenski is a professor of communication at the University of Arizona and the author of "The Obama Victory: How Media Money and Message Shaped the 2008 Election."