Aaron Blake: “Republicans are starting to fret about their base’s lack of enthusiasm ahead of the 2026 midterm elections.”“Those voters were already disproportionately less likely to vote in elections not featuring Donald Trump, and now the GOP has to contend with the president being more unpopular than ever.”“And a new CNN poll drives home the problem: Large portions of Trump’s base are feeling disillusioned over more than a few of his choices lately.”