VP candidates can appear as progressive as they want because at the end of the day they don’t really have that much power. I won’t believe any real shift is happening towards progressives till we get a presidential candidate talking about more progressive policies. Until then it’s mostly them trying to pay lip service to progressive policies while chasing the moderate as the Republicans continue to drag the country to the right. If the Democrats really wanted to get more votes they would stop chasing moderates and try to activate disaffected voters who don’t care about voting because from their perspective both parties don’t really care about helping them. But then that would get in the way of the donors wants or stop politicians from being able to make lots of money from trading stocks and they would rather lose than give up that.