Heh, me too.
Seriously though, you could also argue the opposite, that because World-Wide opinion of the American government is generally extremely low, we want there to be vote-rigging, it would fit nicely with our image of them.
I will accept your point that it would be very hard indeed to convince people of vote fraud, but that's an ongoing paradox through the West at the moment, I think the Internet is partly to blame, we are subjected to so many off-the-wall viewpoints these days that no-one pays any attention to them any more. So when someone claims vote rigging, we just think 'Oh look, another conspiracy theorist.'
Whilst I'm loathe to use a term as cliche as 'the truth is out there', I do think that not all 'conspiracy theories' are purely the realm of the Tin Foil Hat brigade, but there are so many now that it's almost impossible to tell the genuine ones from the crackpots.
The problem is, I guess, more than anything now, America needs a 'clean' election, where there are as few doubts raised about the result as possibly. Personally, I'd recommend going back to paper balloting, there still seems to be a great deal of Technophobia in various sections of American society, people trust paper. It will have to go electronic eventually, but they need to do a lot more to make sure the system is secure and publicly trusted.