Check out "The Rise of the New New Left", by Peter Beinart
It is these two factors—their economic hardship in an age of limited government protection and their resistance to right-wing cultural populism—that best explain why on economic issues, Millennials lean so far left. In 2010, Pew found that two-thirds of Millennials favored a bigger government with more services over a cheaper one with fewer services, a margin 25 points above the rest of the population. While large majorities of older and middle-aged Americans favored repealing Obamacare in late 2012, Millennials favored expanding it, by 17 points. Millennials are substantially more pro–labor union than the population at large.
Most striking of all, Millennials are more willing than their elders to challenge cherished American myths about capitalism and class. According to a 2011 Pew study, Americans under 30 are the only segment of the population to describe themselves as “have nots” rather than “haves.” They are far more likely than older Americans to say that business enjoys more control over their lives than government. And unlike older Americans, who favor capitalism over socialism by roughly 25 points, Millennials, narrowly, favor socialism.