>>149857155
>>149857434
I see it going like this:
Ernest is either working as a telephone operator or as a receptionist at the mayor's office. Every day he has to handle complaint calls and tries to pass them along to the mayor who always is either out or pretends to be too busy to listen. So Ernest, having promised the people over the phone that he will get their complaints to the mayor, shows up at a town hall meeting where it's the mayor's job to listen and undoes a list of complaints that unrolls like a scroll, hits the ground and keeps going.
As he reads the complaints, the people start agreeing with him hand say he would be a better mayor than their current guy. The mayor asks Ernest
"Why would anyone vote for this clown?"
And Ernest responds "I dunno, I'm just Ernest."
Which people mistake for meaning earnest, so "I'm just earnest" becomes his campaign slogan.
There's likely some corrupt company in town backing Ernest to try to get a figurehead mayor put in place, one so dumb they wouldn't even need to pay him off.