That's why this quote from the March 5 edition of the New York Times is so intriguing:
"Mrs. Clinton maintained an edge over Mr. Obama among women, whites, Hispanics, older voters and those with less education. Mr. Obama continued to edge her out among men, blacks, younger voters and those with more education, according to an exit poll conducted statewide by Edison/Mitofsky for the National Election Pool."
So she has trouble with blacks and younger voters, and he has trouble with older voters. This is significant. If she gets the nomination, all his new support is disenfranchised and doesn’t go to the polls. If he gets the nomination, the old folks look to McCain because "he’s one of them."