The left-wing tilt of the under-30 cohort is sometimes glossed as primarily driven by cultural issues. Millenials are, for example, much more favorable to gay rights claims. But as Ruy Teixeira points out it extends considerably beyond that to economic questions as well:
I assume this kind of thing will be pretty heavily shaped by assessments of what actually takes place in the Obama years.
CORRECTION: This chart is mislabeled. The question wording that’s up there is from the Progressive Studies Program Millenials survey and produced a 60/27 split in favor of big government. The 78/22 split was provoked by a National Election Survey question that asked “We need a strong government to handle today’s complex economic problems” vs “the free market can handle these problems without government being involved.” I think the basic point stands despite the error.