The Milwaukee Bucks had a chance to tighten the race in the NBA's Central Division Wednesday night, hosting the division leading Chicago Bulls.  The visitors went on a 20-4 run in the second quarter to open up a double digit lead and held off the Bucks at the BMO Harris Bradley Center 104-88.  Nate Robinson led Chicago (28-17) with 24 points, former Marquette standout Jimmy Butler added 18.  The Bucks (24-20) were led by Ersan Ilyasova with 18 points.  Brandon Jennings scored 15 but was ejected late in the game for arguing a foul call.  Samuel Dalembert had 14 points and 13 rebounds for the Bucks who now trail the Bulls by three and a half games.  Milwaukee travels to New York to face the Knicks on Friday night.