Former President Carter and Al Gore have discussed plans to tell Hillary Rodham Clinton that she must abandon her presidential bid, for the sake of the Democratic Party. "They're in discussions," a source close to Carter told the Scotland on Sunday newspaper. "Carter has been talking to Gore. They will act, possibly together, or in sequence." The newspaper said the message will be delivered — it's just a matter of when. Barack Obama leads Clinton in the race for pledged delegates, and political experts say its nearly impossible for her to catch. But she retains a lead among superdelegates, and...