Why would anyone be surprised by this? He is a communist. They are all about hoarding money, OTHER PEOPLE"S MONEY in particular.
Putin is a prime example. He is one of the richest if not the richest person in the world, and he has stolen virtually everything he has. Putin would be a role model for the likes of a light weight communist like Sanders.
He is another one that has long overstayed his welcome in Washington. Republicans should be investigating the heck out of him and force him out of the Senate. But then again, they are almost all crooks.