Since I am not privy to the mind of @berniesanders, I am not about to begin to guess why he chose to downvote @pawsdog.
With the crap that comes at him, it's possible he's mistaken @pawsdog for one of the haejin cult.. who knows
collateral damage happens and it sucks that you experienced a drop in rep @pawsdog but you can recover it. Actual idiots have managed to rebuild their rep and you aren't one.