WASHINGTON - Mitt Romney had already sent out invitations for his Phoenix fund-raiser, offering supporters the chance to meet him in a Chase Field luxury box over a $300-per-person lunch or a $3,000 VIP reception. But when former rival John McCain called with an offer to be listed as host for the event in his hometown, Romney happily went back to the printer for a new invitation with McCain’s name emblazoned on it. Yesterday, McCain’s gesture helped Romney’s political action committee raise about $80,000. It also consummated an 18-month rapprochement between two competitors who battled for the 2008 GOP presidential...