The Pew Research Center has published a poll showing that Democrats are losing their advantage among millennials:
The "Millennial Generation" of young voters played a big role in the resurgence of the Democratic Party in the 2006 and 2008 elections, but their attachment to the Democratic Party weakened markedly over the course of 2009. The Democratic advantage over the Republicans in party affiliation among young voters, including those who "lean" to a party, reached a whopping 62% to 30% margin in 2008. But by the end of 2009 this 32-point margin had shrunk to just 14 points: 54% Democrat, 40% Republican.