With Mitt Romney's big wins last week and the political world declaring the GOP race over, all eyes have shifted to Rick Santorum.

Santorum, a devout Catholic, is taking a few days off for the Easter holiday. His campaign, though, says he is not rethinking his plans, and he will fight to win Pennsylvania, which holds its primary April 24th. But we'll see if that changes. Polls in the Keystone State are tightening between him and Romney, and Santorum can't afford to lose his home state.

Meanwhile, Mitt Romney and President Obama are now targeting each other. Expect more of that in the Week Ahead.

On Sunday... David Gregory's guests on Meet the Press are Governor John Kasich, a Republican from Ohio, and Senator Dick Durbin, a Democrat from Illinois. They'll be talking about the general election.

On Monday... Santorum campaigns in Pennsylvania. He will STAY in the state all week trying to maintain his lead.

On Wednesday... First Lady Michelle Obama will appear on The Colbert Report. It will be her first time on the show since April 2008. Longtime Indiana Senator Richard Lugar, who is in a fight for his political life, faces off in a Republican primary debate with state Treasurer Richard Mourdock.

On Thursday... In New Hampshire, it will be the fourth in a series of swing-state addresses for Vice President Joe Biden.

Oral arguments begin at the Supreme Court, President Obama goes to Korea, the Battle in the Bayou, Mitt Romney on Leno and Vice President Biden campaigns in Iowa.

Special thanks to editor Wayne Dennis.

The biggest day of the GOP race is Tuesday when 424 delegates are at stake in 11 states. Can Romney wrap up the nomination? Or will the fight extend into the Spring? Plus, new jobs numbers, Gingrich on Meet the Press and new NBC polls nationally and in Ohio and Virginia ahead of Super Tuesday.

Video edited by Domenico Montanaro

Republicans debate for the 20^th time, a new NBC-Marist poll, Vice President Biden raises money for Obama reelection campaign, and look who’s talking now.

GOP Voters Head to the Polls in more battleground states and conservatives gather in Washington. After Nevada, it’s on to Missouri, Colorado and Minnesota and the Conservative Political Action Conference begins.

Voters head to polls in Florida Tuesday and President Obama holds an online Town Hall with Google.

South Carolina Republican voters head to the polls, Next stop for the GOP -- Florida, and President Obama delivers the State of the Union.

Special Thanks, as always, to Drew Fredrickson for your lighting, ingenuity, and... acting.