Well, that was almost as inevitable as Hillary's nomination.
I've been saying Clinton/Kaine since November 2014, lol. Before that I thought Clinton/Warner. 
IceSpear flashback:
Why pick Kaine when you have Warner who is better in every way?
Well, in a Trump "damn all modesty" election cycle, I have to quote myself from April (with Frodo in a supporting role
) :
Interesting question, especially because this election cycle has been so different.
On the Democratic side, I imagine that Clinton already has a vetting process going on quietly (and unless she is facing Kasich, my bet is her choice is someone like Sen. Kaine).
If Hillary is to have any hope of reuniting the Democratic Party and reconciling Sanders' supporters to her nomination, she will more likely pick a progressive (not a moderate) as her running-mate.
By this point, that should be a given.
That really depends on circumstances. Note that I said "unless she is facing Kasich (i.e. a more moderate opponent)". If she is running against Trump or Cruz, she will NOT need a "progressive" VP pick to energize the base. Could you really see any Bernie supporters vote GOP or even abstain in a Clinton-Cruz or Clinton-Trump matchup for example? And with someone moderate as VP, she could just scoop up the votes in the middle as well.
