As you are fully aware, the Democratic Party is not going to label their policies Marxist as that term is toxic (for now). There is no question the Party is headed squarely in that direction. Mamdani is well on his way of becoming the Mayor of the country's most important city. He openly advocates for owning the means of production - city run subsidized grocery stores, freezing the rent, nationalizing all utility companies, free bus services, free childcare, free baby baskets, eliminating billionaires, massive tax increases on the "rich", etc. This on top of supporting defunding the police and spending 65M on gender affirming care.
Of course, he uses the term "Democratic Socialist" to seem less scary - more Scandinavian like. So, you'll need to wait on those links until the hard left wins the Presidential nomination and modifies the Party platform - around the summer of 2028.