Of more concern to Trump, though, should be the erosion of support from voters who were critical to his election.

A lot of attention has been paid to the core, fervent base of support that Trump enjoyed from the primaries through the general election. But he won because more-moderate Republicans who were iffy about him ended up voting the party line. They, like a number of independents, didn’t really like him, but they liked Hillary Clinton even less.

That’s a problem because Trump has seen a big drop in support from precisely those groups. Republicans overall have shed 11 points of support for Trump — but moderate Republicans have dropped 17 points since January.

That group is smaller than the number of Republicans overall, meaning that the margin of error is bigger and the 17-point drop may be exaggerated. But when any group of Republicans has only a 58 percent approval of a Republican president, that’s … not great.

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But this is simply not sustainable for a president who hopes to be reelected — and, perhaps, for his party if it hopes to maintain control of Congress in 2018.

Trump won last year despite, not because of, the amount of support he received in the election. He lost the popular vote by millions but won where it counted. His 78,000-vote margin in Wisconsin, Pennsylvania and Michigan was 0.06 percent of all votes cast, but it gave him the presidency.