Republicans and Democrats vehemently disagree over whether Virginia should adopt a new congressional map for the November midterms, but they’re leaning on the same person to sway ​voters to their side: former U.S. President Barack Obama.

Ahead of Virginia’s statewide special election on Tuesday, Obama has become an omnipresent voice of an expensive, high-stakes campaign that ‌could be critical in determining which party controls the House of Representatives after November’s elections.

The former president - once an opponent of gerrymandering - has endorsed efforts by Virginia’s Democratic Party to allow the state’s legislature to create new congressional districts that could give Democrats four additional seats in Congress, offsetting similar Republican efforts undertaken at Donald Trump’s behest in Texas and several other states.