ABC News -- Earlier today we were surprised to see promotion for a debate between former presidents George W. Bush and Bill Clinton at Radio City Music Hall in February. It was billed as a debate with topics ranging from the economy, to foreign policy, to the current administration," according to a statement released by MSG Entertainment. Really? The two former leaders of the free world, head to head? That might be worth the price of admission, which incidentally was pretty steep, ranging from $60 to $1250. But now we are hearing that this event has been cancelled by the former presidents who say they never agreed to a debate, but back to back speeches. Clinton and Bush have done the joint appearance thing before last spring in Toronto. But a true...