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Biden apologizes to Roberts

From NBC's Pete Williams and Antoine Sanfuentes

Sources familiar with the conversation say Vice President Joe Biden telephoned Chief Justice John Roberts last week to apologize for a remark he made about the chief's memory.

"My memory is not as good as Chief Justice Roberts's," Biden said last Wednesday, as he prepared to administer the oath of office to new senior White House staffers. The remark did not appear to go over well with President Obama, who did not smile, though some in the room laughed. Biden's remark came the day after the infamous flub that occurred as Roberts led Obama through the oath of office.

A spokesman for the vice president confirms that Biden called Roberts after making the remark. 

"They had a good conversation," the spokesperson said.

A Supreme Court official declined to comment.