Ruy Teixeira believes Obama's re-election will hinge on them:
On the state level, in contrast to 2008 where the youth vote put Obama over the top in only two states, North Carolina and Indiana, there could be many instances where the youth vote makes the difference in 2012. Consider Ohio. Obama carried 18 to 29-year-olds with 61 percent against John McCain’s 26 percent in 2008, while losing seniors 44-55. Both groups were 17 percent of Ohio voters. Thus, if Obama splits 30 to 64-year-old voters roughly evenly in 2012—significantly worse than he did in 2008—he will likely still win the state if youth voters continue to be more pro-Obama than seniors are anti-Obama.
The Dish 