Cut tenderloin crosswise into 1/4-inch-thick slices. Heat oil in a large skillet coated with cooking spray over medium-high heat. Combine salt, black pepper, and sage, and sprinkle over both sides of pork medallions. Coat medallions with cooking spray. Add half of pork to pan; cook 3 minutes on each side or until browned. Remove pork from pan; keep warm. Repeat procedure with remaining pork.
Recoat pan with cooking spray. Add onion and 1/4 cup wine; sauté 2 minutes. Combine remaining 1/2 cup wine, broth, and next 4 ingredients in a small bowl, stirring until smooth. Add wine mixture and dried cherries to pan. Cook 4 minutes or until thick, stirring constantly. Spoon cherry mixture evenly over pork.