One of the Marine Corps’ biggest advocates in Congress is facing a tough re-election fight, and a former commandant has lent his name to the campaign with hopes it will swing some votes in a district teeming with active-duty Marines and veterans. Voters in eastern North Carolina head to the polls Tuesday to determine whether Republican Rep. Walter Jones survives what’s been a heated primary contest with challenger Taylor Griffin, who worked for the Treasury Department during George W. Bush’s tenure in the White House. The race has generated significant buzz beyond North Carolina thanks to Griffin’s powerful connections, including to former…