Donald Trump won most of the delegates in Tuesday’s contests but he still must do better to win the nomination before the Republican National Convention this summer.

Trump won three out of the four states that voted Tuesday. But Trump’s lead over Ted Cruz in the race for delegates grew by only 15 delegates. That’s because all four states awarded delegates proportionally, so even the second-place finisher got some.

Trump has won most of the states that have voted so far, but he is winning only 44 percent of the delegates. Cruz is doing worse, winning only 34 percent. It takes a majority of the delegates to win the nomination.

The delegate math highlights the importance of primaries in states like Ohio and Florida, which allocate all of their delegates to the winner. The two delegate-rich states vote next Tuesday.

In the overall race for delegates, Trump has 458 and Cruz has 359. Marco Rubio has 151 delegates and John Kasich has 54.

It takes 1,237 delegates to win the Republican nomination for president.

In the Democratic race…

Bernie Sanders has won the Democratic presidential primary in Michigan, claiming victory over Hillary Clinton in an industrial Midwest state where voters expressed concerns about trade and jobs.

But despite his close win, he won’t see any real gains in delegates for the night. And Clinton has now earned more than half of the 2,383 delegates needed to clinch the Democratic nomination.

With 130 Michigan delegates at stake, Sanders will win at least 63 and Clinton at least 52. His gains will be canceled out by Clinton’s earlier win in Mississippi. She already entered the night with a 196-delegate lead over Sanders based on primaries and caucuses alone.

Democrats award delegates in proportion to the vote, so Clinton was able to add on a good chunk of delegates even after losing Michigan.

Including superdelegates, her lead becomes even bigger — at least 1,214 to Sanders’ 566.

Still, Sanders can claim a small streak of wins going into a pivotal batch of delegate-rich contests next week.

Since Super Tuesday, Sanders has now won four of the last six states holding contests. Next week, Democratic voters head to the polls in Ohio, Illinois, Missouri, North Carolina and Florida. In all, 691 delegates will be at stake.

— Source: The Associated Press