Jeffrey Phelps / EPA
An election worker puts up a clock above voting booths in Saukville, Wisconsin, on April 3. Reports state that voters are going to the polls in Wisconsin, Maryland and Washington to make their choice in the Republican presidential primary election.
Jacquelyn Martin / AP
Election worker Marline Coughman tapes a "voting" sign outside of Eastern Market on Washington's primary day in Washington, Tuesday, April 3.
Luis M. Alvarez / AP
Michael Finn votes at a polling place during a primary election in Ballenger Creek, Md., on Tuesday, April 3. Candidates in Maryland's 6th Congressional District focused their last-minute campaigning mainly on Montgomery and Frederick counties Tuesday as voters went to the polls to choose their parties' nominees.
Although Rick Santorum has claimed the Wisconsin primary isn't "do or die," pretty much everyone else seems to disagree. The Daily Rundown's Chuck Todd reports.
For more on the primary season and to see results later today check out the NBC Politics.com reports.