While that is a small concern, these match most of the national polls of late.
Also, the 2012 vote was 51-47, exactly what it was in real life (in past polls we had actually seen Romney underpolling as is American tradition to say they voted for a winner).
Do we really think there are Obama Dixiecrats out there that are just voting against Hillary? That doesn't make any sense. Who are these Obama/Republican voters, and does their race matter? Even party affiliation doesn't seem to be far off so it's not like Obama-leaning Indies.