Hillary Clinton failed to answer the question on everybody's lips. But the song she was jiving to said it all.Launching her Senate re-election campaign at a rally in Buffalo, New York, she refrained from revealing whether she intended to serve a full six-year term or might cut it short to run for the presidency in 2008. But it was no coincidence that when she was joined by her husband and former president Bill Clinton the chorus of the 1970s song they danced to was "We're going to get right back to where we started from", leaving her Democrat supporters in...