This isn’t just on Obama. Under Clinton we knew that Iran’s nuke program was a weapons program. We’ve known for 20 years. Not even Bush 43 took decisive action to stop it. Obama has done the same as Clinton and Bush, kicked the can down the road, hoping that Iran doesn’t get a working bomb and test it on his watch.
We haven’t even had meaningful sanctions on Iran over the past 20 years. Not that sanctions work, but the idea that we’ve had them on Iran is actually a myth.