Tony Campana had a two-run, inside-the-park homer and Tyler Colvin added a solo shot to back six solid innings from Ryan Dempster as the Cubs rolled to a 4-3 win over the Reds.  Dempster fanned five, while allowing two runs on four hits to improve to 9-and-8 on the season.  Carlos Marmol worked through a hit batter and walk in the ninth to notch his 24th save for the Northsiders, who have won six games in-a-row.  Ramon Hernandez smacked a solo home run and Mike Leake added an RBI single for Cincinnati.  On the mound, Leake gave up three runs through six innings of duty to absorb the loss.  The Reds have dropped three of their last four contests.