Former Pennsylvania Sen. Rick Santorum will win the Louisiana GOP primary, CNN projects.
Twenty of the state's 46 delegates are at stake in the primary and will be awarded proportionally.
Before the Louisiana vote, former Massachusetts Gov. Mitt Romney had 563 delegates, more than twice the 251 Santorum had in hand, according to a CNN estimate.
A total of 1,144 delegates are needed to secure the Republican nomination ahead of the party's convention in Tampa, Florida, at the end of August.
The Republican candidates face off again on April 3 with contests in Wisconsin, Maryland and the District of Columbia.
Follow real-time results of these contests on CNNPolitics.com, on CNN's apps and on CNN's mobile website. Follow CNN Politics on Facebook and on Twitter at #CNNElections.
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