Voters across much of the South are casting ballots ahead of next month's midterm elections in congressional districts that were redrawn following calls from President Trump. He said it would help the GOP hold the House, where they currently outnumber Democrats 218 to 214 .

In state legislatures over the last year, Republicans tilted about eight more seats their way than Democrats did in response. (That's an estimate, shown on the bar graph below.)

But it's the voters who will decide whether it works.

Here's the catch: Republicans redrew districts partly on how people voted in the presidential election in 2024. Now the political mood has changed and many who voted for President Trump two years ago could be voting for Democrats, or not voting, in the midterms. The Republicans could lose many of the districts they targeted.

Usually, states redistrict early in each decade after the census. But Trump called on legislatures to do it now.…