MITCHELL, S.D. — Nearly 500 miles from South Dakota’s border, the Rushmore State was shown in prime position. It was behind home plate at Major League Baseball stadium Miller Park in Milwaukee, as the Brewers took on their rivals, the Chicago Cubs. On the padding behind home plate during an April early season series, a banner displayed Mount Rushmore, with “South Dakota” written in cursive script. The promotional banner was visible on TV more than 850 times during the three-game weekend series, accounting for more than two hours of television time.