This should free up Jeff Flake to challenge the president more. I mean, if a pro-Trump challenger is going to primary him, Flake needs as many anti-Trump votes as he can get. Arizona has an open primary for all elections except for presidential elections. So Flake has an incentive to try to get as many anti-Trump protest votes in the primary as he can. If the Democratic primary is mostly uncontested, he can position himself to win the nomination with a slew of motivated Democrats eager to take down Trump's guy in the GOP primary.
