Biden’s campaign committed to choosing a black woman, and Harris has the highest profile of the women being considered (aside from Michelle O who is probably not interested). That’s about all there is to it.
I saw this posted on another blog, so I can’t take credit.
Every reporter in America needs to ask Joe Biden a simple question over and over and over again.
“Who did you choose as your Vice Presidential candidate.”
The trick is to see if he can answer the question without fumbling through his notes. :-)