Even if Trump wins both Florida and Ohio, he’ll likely need until June to clinch the nomination, assuming Sen. Ted Cruz remains in the race.

Broadly speaking, the reason is that after March 15, the primary calendar becomes a lot more spread out. In the first two weeks of this month, 24 states will have voted, plus Washington, D.C. But between March 16 and June 6, just 16 states will be voting.