Actually, Gore's words may serve to rally the core base of the Democratic Party around him. The secularists, the America-haters, the pro-terrorists, the peace-at-any-price'ers, the better-red-than-dead'ers, all these people form the base of the Democratic Party, and all will be delighted with Al Gore's latest metamorphasis, partly because they cannot remember back far enough to recall that he ever had a different opinion.
Al Gore is trying to win the primary, which given the crowded field and his own very limited political skills is very much in doubt. If the nomination becomes secure he will never mention this speech again, and will probably take the exact opposite position. And his supporters will again never waver, because they are too ignorant, or too personally corrupt to care.