According to Gallup, no.
Gallup finds 13% of registered voters saying they will vote for president for the first time in 2008. That matches the figure Gallup found in its final 2004 pre-election poll.
It is true, according to Gallup, that those who will vote for the first time favor Sen. Obama.
First-time voters show solid support for Obama, 65% to 31%. That is a better showing for the Democratic candidate than in 2004, when first-time voters favored John Kerry over George W. Bush by 55% to 41%.