Pierre, South Dakota - A proposed constitutional amendment that could lead to a huge casino in Sioux Falls was approved Wednesday by a South Dakota Senate Committee. The measure's main sponsor, Senate Democratic Leader Scott Heidepriem of Sioux Falls, said SJ1 is not aimed at building a Sioux Falls casino but is intended to be a threat to prevent construction of a casino in Larchwood, Iowa, only a few miles from Sioux Falls.