Difference is white democrats will vote for black democrats.White republicans rarely vote for black republicans.
I've never seen a single recent study that supports your statement. To the contrary, Allen West got almost 100% of the white Republican vote. That's why he won.
Allen West, an African American, got almost 100% of the white Republican vote in his district last November. There's not a shred of recent evidence to support your statement.
I think using the GOP as a whole rather then 1 or 2 elections in 2 small distracts is a better indicator of how republicans feel about voting for African Americans
That is rule of statistics number 1. Republicans are not going to nominate a black man for president. It just won't happen.