“I think there’s reason to be concerned about it,” said McCain on ABC’s This Week.
“I’ve been in very tough campaigns. I don’t think I’ve seen one that was as personal and as characterized by so many attacks as these are.”
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McCain, who has backed former Massachusetts Gov. Mitt Romney’s bid for the nomination, went head-to-head against Obama in 2008 in the most expensive and drawn-out presidential campaign to date.
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