ARLINGTON, Va. — Speaker Mike Johnson will spend election eve campaigning in two critical House districts in the Old Dominion, exclusively telling The Post the “road to keeping and growing our majority runs directly through Virginia, where we have two veterans who will win and deliver results for Commonwealth families.” The speaker will host events for Republicans Derrick Anderson, who’s running for an open seat, and freshman Rep. Jen Kiggans — and bring along some special guests. “Congresswoman Kiggans is a champion for veterans, our troops, and military families and works across the aisle to fight for Virginia’s 2nd District....