Never...reality is not on your side.
Well you're right on the first part. Liberals have been wrong on every policy issue for 40 years. They were wrong on the Vietnam War, they were wrong on the COld War, they were wrong on Iran--I could not catalogue all the failures of liberalism foreign and domestic here.
But they continue on like someone else must have said that crap. And they get no penalty for being so terribly wrong.
But on the second part you are, of course, wrong. Reality is Obama is the worst president ever. And I include Hosni Mubarack. His policies are atrocious and will lead to real negative consequences for this country, as we've already seen domestically.