In 1898, Campau was reunited with Gus Schmelz, who was then managing the Minneapolis Millers. He was released by Minneapolis in June and immediately signed with Charles Comiskey, owner of the St. Paul Apostles. He played only two months at St. Paul before he was released and then signed by the Kansas City Blues. Kansas City won the Western League championship that year. Campau's fielding error in the second game of the three-game championship series nearly cost Kansas City the championship. Campau later recalled that the costly error occurred when the sun was directly in his eyes in right field, and he had not even seen the ball until it was past him.