Voters may get to decide to legalize Nebraska casinos in an election next year. Supporters of legalized gambling have launched a petition drive to place the issue on the 2020 ballot with financial backing from the economic development corporation owned by the Winnebago Tribe of Nebraska. Neighboring Colorado, Iowa, Kansas, Missouri, and South Dakota all allow commercial casinos. “Hundreds of millions of dollars go across the border every year,” said Lance Morgan, the CEO of Ho-Chunk Inc., the corporation pushing the measure on the tribe’s behalf. “For a Nebraskan to do gaming, you have to go half a mile. It’s…