I doubt it was intentional.
However, even if it was, politicians are human too, I prefer them that way, such behavior among them is actually very common, and who can blame him after that wretched tabloid set-up of a debate?
I mean, seriously... hey, let's question the patriotism of the black guy but not the white woman. Or hey, let's imply he's in cohoots with terrorists because he once sat on the board of a prominent anti-poverty fund that an old 60's radical is also on the board of (along with executives of major corporations). And so forth.