I think you're probably right that the Iranians have a nuke - whether it's NK or former Soviet I'm agnostic - and are confident that it will work. They're itching for an excuse to pop it on the Jews.
Dems are running around on The Hill like scalded dogs doing everything to stop the troop buildup and pushing to create 'other news' to divert the publics attention from the situation that is is spiraling downward ever so surely with Iran, the West, and Russia's recent change of attitude towards ImMadInTheHead.
Tops Dems understand what is going on with Iran and the Left's domestic agenda is being impeded by the possibly of having to fight with Iran and those dollars being diverted from their pork and socialist agenda. Plus, the Dems do not want to have to make hard calls in the event of needed military action against Iran's government, not the average Iranian in that country.