The real question is, what's in it for Pence? Nothing? Checkmate.
Maybe a photo-op with a grateful minority family and some good press for doing what is, obviously, the right thing. I mean... The Trump/Pence ticket could use any kind of positive press they can get. The only picture that comes to mind when I think of either of these guys with a POC is Trump wrangling that obviously uncomfortable little girl.
It's almost refreshing, when most politicians throw aside their convictions and say whatever they need to be elected, to have a politician that sticks to what he believes. Pence doesn't give a shit about you and he's gonna stick to that.