Offering the hope of prosperity as well as the hope of security
Despite what the polls may suggest, I think there are a significant number of "pro-war" people who would be very open to a viable alternative candidate. They may "support the troops", but that doesn't mean they like the direction Bush is taking the country. Bush's main selling point is fear. It is what keeps him in power. If people aren't afraid then they will start asking some very uncomfortable questions (uncomfortable for Dubya). Whoever gets the Democratic nomination has to hit Bush hard on the promotion of fear. He has to make it clear that a real leader offers the hope of prosperity as well as the hope of security. Hmmm... That may make a good campaign slogan.