Some have accused Mr Obama of tyranny and promised to "reclaim America".
In comments to ABC, Mr Obama said race was a "volatile issue" and "it becomes hard for people to separate out race being a sort of part of the backdrop of American society versus race being a predominant factor in any given debate".
"Are there some people who don't like me because of my race?" he said. "I'm sure there are.
"Are there some people who voted for me only because of my race? There are probably some of those too.
HEALTHCARE IN THE US
46 million uninsured, 25 million under-insured
Healthcare costs represent 16% of GDP, almost twice OECD average
Reform plans would require all Americans to get insurance
Some propose public option to compete with private insurers
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