In a remark Thursday in Virginia, Obama highlighted Romney's wealth — along with his own — making it clear that both candidates are well-heeled.
"You can decide whether we give a massive new tax cut to folks like me and Mr. Romney, who don't need it — he doesn't even need — he needs it even less than I do — or whether we work to keep taxes low for Americans who are still trying to make it," Obama said.
In that same speech, the 51-year-old Obama poked fun at the 65-year-old Romney. Talking about Romney's criticism of his energy policies, Obama said, "Maybe the steam engine is more his speed."
Defining who is American can be problematic for campaigns.
In July, former New Hampshire Gov. John Sununu, a surrogate of the Romney campaign, said on a conference call that he wished Obama "would learn how to be an American." That touched off a firestorm of criticism and Sununu later said he misspoke.
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