be a shoo-in
be a shoo-inINFORMAL
If someone is a shoo-in for something such as an election or contest, they are certain to win. Note: `Shoo-in' is sometimes spelled `shoe-in'. The president seemed a shoo-in for a second term, even though the election was some 20 months away. She seemed like a shoo-in. But in the past month she has seen her 20-point lead reduced to a mere five percentage points.