McSally can beat Ruben Gallego in 2020,but Arizona needs to be careful because it is a swing state now.
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Prediction: The incredibly piss-poor candidate McSally loses to Gallego in 2020 and Governor Ducey runs against Gallego in 2022 (and beats him) when his new term as Governor ends.
I believe that is also Duceys calculation and reason for selecting McSally instead of a better candidate who would win in 2020.
If Gallego wins in 2020, then Ducy would have to wait until 2026 to run against him, not 2022.