Progressives are on the march again in the Democratic Party — and the question is whether their momentum can be sustained. The case that the progressive tide will keep rising is built around the tangible excitement sparked by some prominent left-wing candidates, the frustration among many Democratic voters with their party leadership, and the capacity of President Trump to mobilize his opponents as much as he does his supporters.

Voices that are more skeptical of the left caution against extrapolating national trends from a handful of elections and argue that most contests at the state level and beyond are still won in the center ground. They also look back to last fall, when then-Vice President Kamala Harris was cast by Republicans as left of the mainstream on issues such as trans rights

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