WAUKESHA, Wis. (AP) — John McCain is questioning Barack Obama’s ties to a 1960s radical. In his strongest criticism of his presidential rival, McCain told a Wisconsin town-hall crowd: “We need to know the full extent of the relationship.” Obama and William Ayers, now a college professor, live in the same Chicago neighborhood and have served together on two nonprofit organization boards. The Illinois senator, who was a child when Ayers’ group committed acts of domestic terrorism, has denounced Ayers’ radical views and actions.—-Contact The Daily Reveille’s news staff at [email protected]