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Sanders vs. Clinton: What you need to know

Tonight's outcome could determine whether Sanders remains a real threat to the nomination for Clinton, or is relegated to the role of protest candidate.

Supporters of Democratic presidential candidate Bernie Sanders are seen in silhouette behind the U.S. flag during a rally in Charlotte, N.C., March 14, 2016. (Photo by Shannon Stapleton/Reuters)
Supporters of Democratic presidential candidate Bernie Sanders are seen in silhouette behind the U.S. flag during a rally in Charlotte, N.C., March 14, 2016.REUTERS

Alex Seitz-Wald