Former President Donald Trump scored decisive victories in Tuesday evening’s primaries.

But a closer look at the electoral margins shows that a sizeable chunk of voters in several primary states cast protest votes for non-Trump candidates, yet another warning sign for the presumptive GOP nominee’s 2024 coalition ahead of an election that could be decided by tens of thousands of votes in a handful of swing states. Former presidential candidate Nikki Haley captured double-digit support from Republican primary voters in Ohio, Illinois, Arizona, and Florida, costing Trump about one-fifth of the primary electorate in those states.

Trump’s worst performance of the night was in Kansas. With more than 95 percent of ballots counted as of this writing, he notched 75.5 percent of the vote, Haley drew 16.1 percent, and another 5.2 percent selected “none of the names shown.”

To be sure, early voting began in Ohio, Kansas, and Illinois in February, weeks before Haley dropped out, on March 6, after a poor Super Tuesday showing. Still, the margins suggest the former president’s 2024 team has work to do in shoring up support from the minority cohort of disaffected Republicans who are on the fence about or adamantly opposed to casting their ballot for Trump in November. The fact that so many Republicans were willing to go to the polls . . .