http://harvardharrispoll.com/wp-content/uploads/2018/01/Final_HHP_Jan2018-Refield_RegisteredVoters_XTab.pdf
Here's a poll from 2018 that asked voters, "Do you think we should have basically open borders or do you think we need secure borders?"
Despite the horrifically worded question (basically is a HUGE qualifier, and "open borders" should have been defined), 32% of Democrats said open borders, and the other 68% said secure borders. I'm assuming that had they whittled the question down to get to what All3 thinks most Democrats believe, the results would be closer to 10-20%.
There isn't any polling on abolishing police, but that's not really the argument that Democrats are making. Defunding the police doesn't mean abolishing the police, and Joe Biden has made it extremely clear that he wants to expand police budgets.
Tldr, All3 is full of ****.