The subject is the recent Democratic National Convention, and Robby Takac, bassist for the Goo Goo Dolls, the multi-platinum rock band that performed brief acoustic sets at several campaign-related functions, is being, well, diplomatic about his impressions."It was really interesting for me to see how political politics is," Takac observes with a chuckle. `I'm in a pretty political business myself, you know.` That might be an understatement. The Goo Goo Dolls began life back in 1987 as a Buffalo, N.Y., punk band modeled on the hard-living Godfathers of Grunge, the Replac