Dan Quayle was not belittled just because he couldn't spell potato. Quayle was mocked because every time he opened his mouth he said something stupid.
I'm not going to comment on every one of the gaffes but I'll comment on the last two that you seem to think are so serious.

Obama said that he saw some pictures in Life magazine when he was 9 but apparently he got the magazine name wrong. Do you remember what magazines you were reading when you were 9? Or are you claiming that Obama could never have seen pictures such as those described?

Malkin writes: 'And in perhaps the most seriously troubling set of gaffes of them all, Obama told a Portland crowd over the weekend that Iran doesn't "pose a serious threat to us" — cluelessly arguing that "tiny countries" with small defense budgets can't do us harm — and then promptly flip-flopped the next day, claiming, "I've made it clear for years that the threat from Iran is grave."'

Obama never said "Iran doesn't pose a serious threat to us." His exact words were, "Iran, Cuba, Venezuela—these countries are tiny compared to the Soviet Union. They don't pose a serious threat to us the way the Soviet Union posed a threat to us." Do you disagree with this? Do you think that Iran is as dangerous to us as the USSR was during the cold war? Do you think Iran has the capability of dropping 20 megaton nuclear warheads in everyone of our cities? Would you rather fight a war against Iran in 2008 or the USSR in 1978?
Now please just go away.

Michelle, you nailed this one. "If it looks like a duck, walks like a duck, and quacks like a duck...it must be a duck."
Blessings,
RWB

michelle,are you mad because the price of rice is so high?