Governor George Romney (R-MI) / Governor Ronald Reagan (R-CA)
Senator Eugene McCarthy (D-MN) / Senator Robert Kennedy (D-NY) ✓
Fmr. Governor George Wallace (AIP-AL) / Congressman Bob Sikes (AIP-FL)
Vietnam would be pretty damning for Nixon's successor, and Romney wasn't a great campaigner. McCarthy is ultimately saved by Western Hispanics who Kennedy continues his brother's 1960 outreach to. Wallace runs again, and while there's a play for the South by Republicans, it's less successful than OTL Nixon's with the growing institutional strength of Wallace's party.