Vice President George Bush praised the acceptance speech of rival Michael Dukakis on Friday but said he intends to highlight the differences between the Democratic nominee and Dukakis' own running-mate, Lloyd Bentsen. Bush told reporters in Milwaukee that "an effective use for Lloyd Bentsen" would be for him to persuade Dukakis to change his positions on gun control, prison furlough programs and a host of other issues. "The differences are enormous" between Dukakis and Bentsen, said Bush. The vice president refused to be critical of Dukakis on anything other than issues. Bush said he watched Dukakis' speech to the Democratic convention. "I thought he gave a very good speech. He did a very good job."