That's exactly what's happening with the poll numbers.
It happened in VA and NJ, also, when exit pollers asked people who presumably voted against the Dem gubernatorial candidate about Obama. They "liked" him, because to say otherwise is non-PC.
All this will, in the long run, come back to bite him, if we survive.
This is really about the so-called Bradley effect. It is interesting to talk about but, as I recall, it was pretty much disproven in the 2008 presidential election.