If Kerry is elected, it will reopen the floodgates to all sorts of left-wing extremists to force their restrictive agendas down everyones throats (including, but not limited to, anti-hunting, anti-firearms, loss of access to wildlands, further lawsuits against doctors, ranchers, businesses, tobacco companies, etc.). Liberals are very liberal with how they will control and restrict your activities, given the chance.
More importantly, a Kerry presidency is a win for the United Nations who do not value American values or respect Amercian sovereignty. Terrorists know that liberals/democrats are soft on national defense and will actually make excuses for terrorism instead of combating it. North Korea today has announced that it will not deal further with the U.S. until and unless Kerry becomes president. Yesterday, Putin has also stated that a Kerry win would be seen as a win for terrorism.
Kerry and the rest of his party who do nothing but divide the country can go to hell. Zell Miller is one of the few Americans left in the democratic party. Him, I'd vote for in a heartbeat.