Here is another quote from the same speach...
"Like Al-Qaeda and the Sunni extremists, the Iranian regime has clear aims. They want to drive America out of the region, to destroy Israel, and to dominate the broader Middle East," said the US presidents.
Link
Seems right to me.
I also think that his comparisons are pretty logical as well. Nazi fastism was rooted in a core belief that Germanic peoples were the chosen ones and Jews were the cause of all the German problems. Al Qaeda and Persian fastists believe that those that follow the Prophet Muhammed are the chosen ones and Israel & the US are the cause of all Arab/Muslim problems. Both use force as a means to their ends.
I realize that I have over-simplified the comparison of the two but I do not think they are really that far off base. Besides as long as there is a terrorist threat I think it perfectly applicable for a President to talk about it without considering it "fishing for support".