One of the Republican Party’s biggest donors is working to defeat Arkansas Sen. John Boozman in next year’s GOP primary. Dick Uihlein, a prominent conservative megadonor, is giving $1 million to a newly formed super PAC aligned with Republican Jake Bequette, according to a person familiar with the contribution. Bequette is an Iraq war veteran and retired NFL player who is challenging Boozman. Uihlein, an Illinois shipping and supply company executive, has a long history of giving to anti-establishment causes. Earlier this year, he cut a $2.5 million check to a super PAC bolstering Missouri Senate hopeful Eric Greitens, a...