'A rousing revival of "Johnny B. Goode" swept through a third floor ballroom at the Westin Copley hotel Friday night, as Senator John F. Kerry asked 200 of his volunteers to use their enthusiasm for his presidential campaign to volunteer for other Democrats in Massachusetts. "We did an amazing job -- you did an amazing job -- and I want you to leave here today convinced that if we keep on working, keep on fighting, keep on organizing, and keep on caring nobody has to redefine the Democratic Party," said the unsuccessful presidential candidate, to cheers and digital camera flashes....