Its a stupid attack on Biden that's in danger of backfiring. First it reeks of craven opportunism that would make Kristen Gillenbrand blush.

But more important its absurd to think Obama picked a bigot to serve as his VP?
For whatever reason the press hates two Dems running for Prez - Biden and Sanders. Don't know if they have it in for old white guys, but I suspect in Bernie's case its because he's not a schmoozer and most likely serves Long Trail at his Beltway cocktail parties if he holds them at all. But expect to see more ticky tack stories like "Sanders took a private plane to an event" or other such nonsense.
In Biden's case they like to embellish or just make things up. For example back when he was VP the press reported that he'd inadvertently given away the location of the secret bunker he'd go to in case of an attack. He'd done nothing of the sort, but it took about a week and a story on page 30 in small print before the media corrected itself.