MADISON, WI (WTAQ) - Wisconsin Democrats say they'll keep trying to require criminal background checks for virtually all gun sales -- including those at gun shows, and private sales outside of gun shops. Republicans struck down the idea at both the state and federal levels over the last two years. On Tuesday, Milwaukee Senate Democrat Nikiya Harris Dodd tried but failed to add the expanded background checks to a Republican bill which ends the 48-hour waiting period to buy guns. That measure was okayed by the Senate without amendments, and was sent to the Assembly.