Despite who "inspects" the deal lapses in 15 years. Even the most brain-dead, far-left liberal would see that this virtually guarantees that Iran gets the bomb. Saudi Arabia and other countries in the Middle East are hardly likely to allow this to happen, so they will build their own nuclear capability and the delivery systems for them.
Voila, a Middle East nuclear arms race, the consequences of which, can only be guessed at. It is NOT a question of whether Iran is evil or not. It's a case of keeping an erratic regime that supports terrorism from getting the bomb. It's a question of whether we are going to support our allies in the region (Israel, Saudia Arabia and Jordan just to mention three) or whether we are going to support an agreement which offers us nothing and gives away the store to Iran.