er... neo-liberals are what the world refers to when you talk about 'conservatives' who seek to implement classical liberalism, that is, the unfettered free market, the transfer of wealth from the working class to the rich tycoons who use the military to browbeat or invade other countries for their resources or for the hell of it. That is, Bush, his minions and those who control him and through him, you. Neoliberals are the World Bank, the IMF and Wall Street-types who you'll give 2000 to every year till doomsday. They are the ones who wanted and planned the invasion of Iraq (and Iran and any other country that doesn't want a shit sandwich shoved down its throat, said sandwich being bankruptcy and destitution of the middle and working class. See Mexico, Argentina, Iraq, Indonesia and for good measure all those ex-communist countries in Europe still drawing down the pitiful savings they made under the Reds). It is more likely that some conservative neoliberal or neoconservative (they're practically synonyms) blows up half the States as ungrateful devil-worshippers if Bush lost or even if they were tired of waiting for the 'rapture'.
Either way, neoliberal terrorists just doesn't cut if, unless of course you posit that it is done to punish /coerce the United States Congress and people to accept some trade or finance measure that will destroy their livelihoods, in which case it won't be found out because it will have been done by and with the support of the United States Government at high levels and blamed on 'Al Qaeda' or Iran or 'ecoterrorists'.
Now, to answer the question, if someone let loose a half-dozen nukes across the USA, the country would, shock horror, continue to exist. Large swathes of the country would be fine - it is 3000 miles across - and with world trade, there are plenty of markets. Sure, GDP drops 30-50% but still things hum along after the shock wears off. NBC containment exists. In 5 years, the country will be prosperous just like it took Russia and Germany and Japan (or for that matter France and Italy 5-10 years to recover and they were totally destroyed). Psychologically the US would have been struck a deep blow and if any foreign involvement was discovered, US forces are plentiful overseas for any needed deployment, supported by allies. Revenge would be swift and overpowering unless it was China or Russia. If so, then it's the end of the World.
If domestic terrorism is 'proven' then that cause is destroyed. Loses all rational support or legitimacy. Patriot Act will continue indefinitely in that situation.