For some Democratic observers, it's been one of the most intensely debated questions of the general election campaign. Can you campaign against the honor of a former POW?

Increasingly, it looks as though Barack Obama's campaign feels as though they have little choice. In response to last week's ad accusing the Illinois Democrat of supporting explicit sex-ed for kindergarten students, an Obama spokesperson called McCain's campaign "perverse."

Now, after McCain himself defended the ad on "The View" Friday morning,...