Why Obama's PR campaign to attack Syria won't work

If President Obama believes he can turn around public opinion on U.S. intervention in Syria with a single speech, or even a few days of intensive public relations campaigning, he is badly mistaken.

Without some huge, earth-shattering event that changes things overnight — a Sept. 11 or a Pearl Harbor — changing public opinion is a slow process. To do it, a leader must make a case over and over and over and over — something Obama has notably failed to do with Syria. So his speech Tuesday night won’t change much.