Buoyed by a decisive win on Saturday in Louisiana's primary and his burgeoning career as a horror movie homagist, Mitt Romney now turns his sights to Wisconsin's primary on April 3, the same day as primaries in Maryland and District of Columbia. Similarly to his wins in Alabama, Mississippi, Tennessee and Oklahoma, Santorum's southern support base consists primarily of white evangelicals -- the same voters who chose Mike Huckabee over John McCain in Louisiana in the last presidential election, CBS News notes.

Evangelicals in the state chose Santorum by a margin of nearly two-to-one. And not everyone who voted for Romney in the state even identify as strong supporters: 40 percent of Romney's voters say "they have reservations" about him, and 55 percent "strongly favor him." (Santorum, by comparison, had 28 percent voicing reservations, and 64 percent strongly in favor.)

Despite the win, the clouds look to be gathering over Santorum's campaign, his 273 delegates trailing far behind Romney's haul, which after his Illinois win now totals 568. As the AP notes, Santorum's under-funded campaign has failed to even register the candidate on the District of Columbia ballot.