The Indiana Senate has rejected a voting map meant to favour Republicans in the 2026 midterms, defying a months-long pressure campaign by the White House. Enough Republican lawmakers in the state joined all Democrats to resist the changes that otherwise would occur every 10 years to reflect population change.

Indiana state Senators are expected to take a final and deciding vote on redistricting Thursday, and the outcome is still uncertain

Indiana Republicans have been targeted because a number of them have done something that few others in the party, either in Washington, D.C., or in state capitals across the country, have dared to do:...