MIAMI, Florida (CNN) -- Battered by accusations that they tried to disenfranchise military voters, Vice President Al Gore's campaign enlisted a war hero of their own Tuesday to call on Republicans to retract those "unfair and irresponsible" claims. Nebraska Sen. Bob Kerrey, a former Democratic presidential candidate and Medal of Honor winner, said allies of Texas Gov. George W. Bush were attempting to undercut the legitimacy of a possible Gore victory in Florida's tight presidential recount. "Many of the things that are being said, if they are believed by the American people as the truth, will cast a pall of...