Virginia Gov. Abigail Spanberger, center, leads a rally in support of redrawing the state's congressional map to help Democrats. Photo: Graeme Sloan/Bloomberg via Getty Images Virginia voters' narrow approval Tuesday of a plan to redraw the state's congressional map has swung the nationwide redistricting fight that President Trump provoked in Democrats' favor — for now, at least. Why it matters: Democrats gambled on an aggressive reworking of the map in a purple state — and won. Four Republican incumbents in Congress now face the prospect of running in Democrat-friendly districts designed to retire them this November. Virginia's congressional delegation is expected to shift from a 6–5 Democratic edge to roughly 10–1, in a state Trump lost by less than 6 points in the 2024 election. Republicans are vowing to appeal to the Virginia Supreme Court, which in February allowed Tuesday's referendum to proceed without ruling on its legality.…