Gore lost white men in 2000 by 24 points and Kerry lost them by 25 points. The difference in the popular vote was that Gore only lost white women by 1 pt. while Kerry lost them by 11. Obama is stronger today because he is ahead by 7 pts. with respect to white women.
Republicans expect to win white men by 20 pts. This is essentially offset by the overwhelming Dem. advantage 35-50 points with nonwhite voters.Thus the key constituency to win over is white women.
If Obama can maintain his strength with this group he will win in November. If not, expect the drumbeat for a Hillary VP nod to get louder.
"Gore lost white men in 2000 by 24 points and Kerry lost them by 25 points."
You can't get everybody's votes, and the stupid white guy vote is the best one to do without.