Remember: When it's done by a bumbling Texan who can't pronounce "nuclear", it's a national embarrassment on which pundits can feed for a week. When it's done by a suave Chicagoan who can't pronounce "corpsman", it's just cute and I have to go to BBC.com to find out exactly what happened in the first place.
At this rate, "Obama" is going to become British slang for one who cannot comport themselves properly at formal functions. "Oh, we can't have Nancy at the reception! She is such an Obama! Remember at the garden party last summer when she tried to 'fist-bump' your grandmother and we spent thirty minutes on our hands and knees under the topiary trying to find her dentures?"