Only 44% of white voters under 30 backed Obama, while 51% voted for Romney. This is a substantial change compared with 2008, when Obama carried the young white vote by 10 points (54% to 44%). Far more young blacks and Hispanics backed Obama than Romney, and there was little fall off in his support among these groups from 2008.
Obama also lost support among young men. Overall, 53% of men under 30 supported Obama, down from 62% in 2008. Fully 66% of young women voted for Obama, similar to the 69% who voted for him in 2008.
However, Obama lost support among both white men and women. Overall, 41% of white men supported Obama while 54% supported Romney. In 2008, Obama won the vote among white men, 52% to 46%. While white women voted for Obama over McCain by a 56% to 42% margin four years ago, they were divided this year (48% voted for Obama, 49% for Romney).
Surprisingly, Obama’s vote also declined among young black men, by 14 points, while holding steady among young black women. – Pew Reasearch