Embrace Code Pink, Bernie or Bust, Jill Stein and any others who position Hillary-Kaine as centrists
Republicans want to paint Hillary as an out-of-the-mainstream liberal (or socialist).
Hillary could either respond "damn right" or she could respond "you're wrong, my views are mainstream American values."
Had Hillary chosen Warren as her running mate, we might conclude that Hillary had chosen the "damn right" path, but Hillary's choice of Kaine tells us that Hillary is reaching out to the center.
If you want to be perceived as a centrist, you need people who oppose you on your right (the whole Republican Party) and your left (Code Pink and Green Party, etc.). Now that Warren and Sanders are 100% behind Hillary, the Republicans would have more success labeling Hillary as "out of the mainstream" if there was no one pushing back at Hillary from her left.
This is the ideal situation: Hillary has opponents who say she's too far to the right but they are only a small 3% to 5% segment of the vote. Don't just accept this; embrace it because this is a part of the definition of "mainstream."
LBJ had a small group of opponents on his left, Carter had a small group of opponents on his left, Bill had a small group of opponents on his left, Obama had a small group of opponents on his left, and they all did just fine. We live in a democracy. We should foresee and accept that our system of government -- the best system yet invented by the human mind -- will and must encompass a broad range of opinions and competing visions for the role of our government.
We cannot claim to represent the mainstream in one breath and -- in the very next breath -- express outrage and surprise that there are some to our left whose views are outside of our mainstream vision.
Embrace the fact that Hillary has chosen a position where she sits in the center with some few on her left and many others on her right.
= new reply since forum marked as read
What a silly OP. 
She deserves the mockery she receives. She certainly shouldn't be embraced by anyone who wants to win in November.
As for the "Kaine is a centrist" silliness, you clearly don't know much about him. He's a liberal.
http://www.ontheissues.org/Senate/Tim_Kaine.htm
The other asshats you mention have no ideology, cause, or intelligence. They aren't even close to the same. Protesters rock. Fart-ins are too complicated for the anti-intellectual boo brigade you mention along side of Code Pink.
Left?
I'll give you credit for an original (if pathetic and transparent) way of declaring for someone other than the Democratic nominee.
Simultaneously clever and sad.