The two most progressive candidates in the 2020 Democratic field struck inspirational tones, with Warren urging Democrats to be "the party of big, structural change." Here are seven takeaways from Tuesday night, the first of the two nights of CNN's Democratic debate in Detroit:1. Delaney began the debate by comparing the two to failed Democratic nominees George McGovern (1972), Walter Mondale (1984) and Michael Dukakis (1988). It's why none of them landed real blows on Warren or Sanders all night. No daylight between Warren and SandersThe top two-polling progressives in the Democratic field were positioned on stage next to each other Tuesday night.