Democratic Missouri Rep. Cori Bush may be headed for a defeat in this year’s primary battle amid a federal investigation and strong criticisms of her positions on the Israel-Hamas war, a new poll suggests. Bush, a member of the so-called “squad” of left-wing House Democrats, is trailing her main primary challenger, Prosecuting Attorney of St. Louis County Wesley Bell, by 22 points with about six months until voters in Missouri’s first congressional district go to the polls for the primary election in August, according to a new poll by MOScout and Remington, a Republican polling firm. Bush is c…