Lieberman willing to star at Republican convention By Manu Raju Posted: 04/15/08 08:06 PM [ET] Sen. Joe Lieberman (I-Conn.), the Democratic Party’s 2000 vice presidential nominee, is leaving open the possibility of giving a keynote address on behalf of Sen. John McCain (Ariz.) at the Republican National Convention in September. Republicans close to the McCain campaign say Lieberman’s appearance at the convention, possibly before a national primetime audience, could help make the case that the presumptive GOP nominee has a record of crossing the aisle. That could appeal to much-needed independent voters. McCain has yet to ask Lieberman to speak,...