Epicurus
Reasonable
How is race a factor when he's LOSING support?
Losing support implies that he had it and is losing it. Did those who previously supported him suddenly become racists?
That is the argument that her hypothesis is unable to overcome.
Obama at one point had over 50% favorability rating. I find it HIGHLY unlikely that some of those supporters saw a picture and said "ZOMG he's black?" and changed their vote.
So that means something else is happening. The media barrage explains a lot of his decrease in favorability ratings.
I argue that it is simply because he was an unknown commodity.