I believe most of them aren't - even though some sure are big morons no doubts it. Contrary to to common whisdom. Infact I believe it even helps them that so many people think they are "morons". It's easy to use them as scape goats. While continuing to vote for the "morons" - hey he/she/it is an idiot but they are one of us! And we can't change it anyway bla bla bla.
I mean who's the real fool? The one leading everyone or the fools that follow him despite knowing it? People love bitching about politicans a lot, often rightfully, but we as citizens are not without blame here I think as we do allow it after all to be ruled by those "morons" if you so will.
Which doesn't mean they aren't incompetent. But that can be simply a lack of knowledge and skill. But I believe quite a lot of politicans are pretty intelligent and know what they are doing otherwise they could not hold them self in power for so long. Like knowing how to play people, how to manipulate, being kinda machiavellian and so on.
So no, I don't see most politicans as "morons". Rather people voting for the same fucktards time and time again despite the scandals and obvious corruption - regardless of party.