In Pennsylvania, the Clinton campaign and the Rendell machine produced a massive turnout. That’s to their credit.
But Barack Obama got almost twice as many votes as any other candidate in the history of the Pennsylvania Presidential primary. So — unless you think that Clinton voters came out specifically to vote against Obama, for which I haven’t seen any evidence — the notion that he displayed “weakness among key demographics” in a way that threatens his electability in the general election really doesn’t pass the giggle test, does it?
Two Democratic candidates excited the Democratic primary electorate as it’s never been excited before. One did somewhat better than the other. But either one, at the head of a unified Democratic Party, ought to stomp John McCain in Pennsylvania in November.
The same analysis applies to various voter segments. The African-American share of the turnout was somewhat smaller than might have been expected, and despite Obama’s appeal to the young the proportion of the youth vote to the total vote did not markedly increase. But in absolute terms, both young people and African-Americans turned out in astounding numbers; it’s just that older people and whites kept pace. How is that A Bad Thing?