McCain's Last Chance, or a Chance to Shine?

NASHVILLE - It's do-or-die for Sen. John McCain, but he is used to that.

The guy's been left for dead "” literally, in one case, and politically in many others "” more times than a pack of General Custers.

So it is ironic but appropriate that his pivotal campaign moment tonight is in a city known for country-music troubadours of last chances.

A week is a year and a month a lifetime in politics. It is an interactive universe; straight-line extrapolations are worse than useless. Still, the clock is winding down on McCain and Gov. Sarah Palin in their race to catch senators Barack Obama and Joe Biden.

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