Originally Posted By: tsuwm
Quinion: mugwump (notice link to 'bated breath' on the right)
Good site!

"Hence the old joke that a mugwump is a person sitting on the fence, with his mug on one side and his wump on the other."

So, synonimous to fence sitter. Also new to me. turncoat, turncloack. And wump is multi-interpretable I assume.