A sure winner.
One that has a sure chance of being chosen, as for a job or other position.
(informal) Someone or something expected to win easily in an election, a race, etc.
(idiomatic) A candidate or contestant generally agreed upon as the presumptive winner; somebody who is well-liked or widely agreed upon.
She's very popular and good with numbers, so I expect she'll be a shoo-in for treasurer.
Origin of shoo-in
- From a sense of the verb shoo, where racehorses would fall back and allow a chosen rider to win a fixed race. See 1910 quotation.