Sanders
Yang
Gabbard
Warren
All worthy candidates.
I'm curious to know what you feel is "unrealistic" about having universal healthcare, considering that every other developed nation on the Earth has it figured out?
What's unrealistic is slashing taxes yet again for the wealthiest Americans, giving 750 billion USD to the Defense Industry every year, perpetuating forever wars, and maintaining a healthcare system that isn't the slightest bit interested in helping people, but rather wants to extort patients financially until they're on the brink of ruin. What's "unrealistic" is expecting the status quo to somehow improve the lives of average Americans without making substantive change.
Cost only matters to right wingers when the proposed programs benefit average Americans. Rand Paul's vote to stop the 9/11 First Responders healthcare bill was a perfect example. If a bill benefits the elite or major corporations - fiscal responsibility goes right out the window. If a bill actually helps people, it's scrapped, to the frantic cry of: "How are we going to pay for it?" How are we going to pay for it?" It's an obvious sham at this point.
There's more than enough money to do most of what the progressive candidates want to do - the right wing just doesn't want to do it, preferring to serve their donors instead.