Why does Clinton need to chose a male running mate?

[King]

She can choose a woman. Clinton/Warren could work.

I do believe consensus is she is best served by selecting a minority running mate and the two best choices (IMO) are both males in Cory Booker and Julian Castro.

[King]

What if Hillary chose Biden again?

[King]

Martin O'Malley would be a terrible pick as VP.

O'Malley is if you took all the worst aspects of John Kerry as a candidate and merged them with all the worst aspects of John Edwards as a candidate--dull, aristocratic, pushover, with paper thin ideas. All he needs to do is cheat on his wife and he's good to go.