The time to “suspend” was when Bomba was battling the Hillary!, when both competed for the left. With Hillary! out, McCain needs to step up and stay current in the news, as Obomba can now move to the center.
"Across the galaxy, he has to travel." - said Yoda to Skywalker.
In order for Obama to move to the center he will need to step over McCain’s body holding firmly at the left of center position.
He does that, and he loses those Hillary voters who might otherwise have gone over to him. He can't afford that. He's got the African American vote in the bag, and they will probably vote in record percentages, just as they did in the primary. But he has to win over Cankles' supporters. He can't do that by moving to the center.