Obama got 66% of the under 30 vote in 2008. He only got 60% of the under 30 vote in 2012.
Yeah, I know, 60% is still ridiculously high, but at least it is trending in the right direction. Kerry got 54% of the under 30 vote in 2004, so the young and stupid voting mostly Democrat is not an entirely new phenomena.
The young (under 30) used to vote reasonably well in America.
In 1968 the Democrats got 47%, in 1972 46%, 1976 51%, 1980 44%, 1984 40%, 1988 47%, and then in 1992 it all went to heck.