I think "Republicans" are counting on lots of Democrats to be dispirited and shaken by Obama and their politicos in Washington under the banner of the D party; I have no clue why anyone would transfer any inclination, to not vote to black-folks to any greater extent. And most Democrats who are already in office and in majority black districts are most likely in safe seats, and whether or not the black vote is depressed won't matter a whit.
He was race baiting, because that is all he has.
He's a thug.
Demographically, a vast majority of Black folks both a.) tend to vote Democrat, and b.) have low turnout. This is standard election strategy - in places like CT or NY, if the inner-city vote turns out, the Democrat will win, if not, the Republican will.
But if you need something to be "outraged" about, go for it.