politics

That's kind of how it always is with an incumbent. The 2012 democratic primary for instance had several states (including New York) cancel their primary entirely. Although that one was funny because Obama nearly lost West Virginia to a prison inmate named "Dark Priest" and there were like 20 declared candidates in New Hampshire. The 2020 Republican primary was also a joke. Several states cancelled and a few changed to a winner take all tally rather than proportional delegates.

There's never been an incumbent president who lost a primary nomination. The closest two things that come to mind are how Ted Kennedy got 37% of the vote in the Democratic primary in 1980, which caused the race to still be contested on the convention floor. But the nomination ultimately went to Jimmy Carter. There's also John Tyler, who was kicked out of his party while the incumbent in 1841 (The Whigs) because he annexed Texas. Then the Whigs nominated Henry Clay in 1845 even though it was still Tyler's first term.