"sanctuary cities are one of the biggest 'open borders' problems"
I didn't know that was where you were going but I responded to "free everything."
Free everything is a little too overbroad.
Free health care, taken literally, is probably extreme, but decoupling your health care from your bank account helps most people, and it's not extreme. A system like Canada, fifteen bucks plus parking, is functionally close enough to free to be able to see it's not extreme.
Free college exists in a lot of other parts of the world, and they're all pretty nice places to live, so that can't really be extreme. There are a lot of differences in those systems that people haven't thought too much about, like how free college is just one part of a large state-run education system. Free college would however mean the whole student debt thing goes away, and that would be a win in its own right.
Canceling student debt is a harder sell, but student debts to for-profit colleges that went under ought to be cancelled. Student loan interest rates are set by Congress, and during the past ten years of rock-bottom interest rates they've been as high at 6.8%; Obama managed to get that down to 5.3% or something. (Thanks Obama.) So, student loans certainly rip off students in a way that would never have happened if they originated with market rates, and it's not extreme to address that.
But I get the argument that cancelling student loan debt is extreme. I'm not convinced it's more extreme than the situation that so much debt exists in the first place. I think a much stronger argument for cancelling it can be made simply from an economic stimulus point of view. That would basically turn into a handout in hopes of building a new generation firmly planted in the middle class, since once the debt disappeared they could afford to buy homes, lease cars, have babies, and get home telephone, cable TV, and Internet locked in at a low price of $99.99 plus taxes for two years if they act now. Plus, they have an education, so these are the kind of people we need if we are going to raise the borders a little bit and stop siphoning so many of the top brains away from China, India, etc. I'm not for closing down our borders but I am for more investment in our own people.