If democrats in the US vote for stuff like Biden, then they’re not voting for any radical change
I don’t exactly know the details, but weren’t there accusations of meddling from the DNC that stoppered Sanders’ chance of securing the nomination, and a belief among some that he might have won the nomination if it had been a free and fair primary process?
In other words, it’s possible (though by no means certain) that your sentence above works if “democrats” means “the DNC and the establishment of the Democratic Party”, but not if it means “people who by-and-large support the Democratic Party”.
High speed rail is fantastic, but good inter-city routes are not a substitute for excellent local city planning. People should be able to live close to their work, and even closer to their daily amenities like shops, hospitals, schools, sports clubs and other social venues, cafes, etc., and should be able to get to them within a short walk or bike ride, without having to rely on long-distance travel like cars or even trains.