Supposable
Part of speech: adjective
Definition: Capable of being supposed; imaginable.
Thinkable
Part of speech: adjective
Definition: Able to be thought or imagined; conceivable; feasible.
Example sentence: It's hard running as an independent. I wouldn't have won the Senate election if I hadn't been governor. I had credibility. The hard part is getting voters to the point where they think it's thinkable and not a waste of time.