I think it is possible but unlikely. People will say that they have no morality and that a person with no morals can't run the country. Even though that neither statement is true (aethiests do have morals and lets be honest to be a politician you have to leave your morals at the door). But it really isn't about what the truth is, but what people think the truth is. Also people will claim that an aethiest will ban religion, which i think is untrue. Most aethists don't care about what religion people hold just that they don't mess with our religion of non-belief. I think that the aethists candidate would lose a lot of the votes from their party because any die hard religious will not want an aithiest president. I think the attack would be brutal as well. Anyone who runs as an aeithiest would have to be ready to be called all manner of terrible things some that will not even make sense but will all hurt.
Hell no. Did you hear about the fit everyone threw over Obama's potential Islamic beliefs that don't exist? Hell would freeze over before an openly atheist candidate was elected president.
I'm optimistic that this could happen in the future, and hopefully even in my lifetime, but it simply couldn't happen today.
In Tennessee it's still illegal for an atheist to hold public office.
Because Tennessee is full of backwards fundamentalists. They just passed a law on Monday that will allow *gag* creationism and climate change denial to be taught in science classes. I'm ashamed to live here.
That's one of the great things about Australia. Our Prime Minister is an atheist and a woman and I'm pretty sure no one even blinked an eye, let alone attacked her for it.