In the wake of Bigot-gate, you will be expecting me to come out with some old Roman versions of politicians putting their feet in it.
My favourite, I mentioned a few months ago (re the Nicholas Winterton gaffe). It's the one about Scipio Nasica who was standing for the Aedileship in the very late third or early second century BC, and canvassing eagerly and shaking the hands of potential voters. He shook the hand of a peasant farmer, which was very horny. "What" said the toff, "do you walk on these".
It was taken as an insult to the honest Roman peasant and he lost the election.
That one comes from Valerius Maximus' book of Memorable Deeds and Sayings -- a collection of Republican anecdotes (compiled in the first century AD, perhaps to be a handy compendium for orators looking for an appropriate story).
It comes from his section "On electoral defeats" (Book VII, 5).
And there are others.