There were unpleasant moments on the Assembly floor Tuesday, when a Republican representative made an obscene gesture at Democratic leader Peter Barca. The initial irritant was a news release GOP Assemblyman Bob Gannon of Slinger issued last week, complaining about Milwaukee’s homicide rate and black unemployment. Democrats demanded an apology. Gannon apologized, but only for making what he called, an improper gesture in the heat of battle. Earlier in the day, members of both parties came together on several issues including four bills aimed at preventing heroin addiction.