By MEG KINNARD
Primary elections are being held in six states on Tuesday. In Missouri, scandal-ridden former Gov. Eric Greitens is attempting a political comeback in his campaign for U.S. Senate. In Michigan, a crowded field of Republican gubernatorial candidates includes a man charged in the Jan. 6, 2021, attack on the U.S. Capitol. In Arizona, a prominent figure in the QAnon conspiracy movement is running for the U.S. House. Three House Republicans who voted to cross party lines to impeach President Donald Trump over the deadly insurrection are also on the ballot Tuesday.