1. It's her duty.

2. There'll never be a better time. If Romney beats Obama, there'll be no more chance for 8 years. Otherwise the 2016 field may include Christie, Jeb, Perry, Rubio, Ryan and West which is much more formidable than Romney, Pawlenty, Cain and Bachmann. Of course Perry may jump in 2012 for the same reason.

3. Four more years of punditry won't add burnish.

4. She's a fighter. If she backs away from this fight then the MSM has won by default. They pronounced that she's stupid, a loser, a bad mother, a has-been, and they would have won and she would have lost. Fighters win or lose in the ring.

5.

There is a tide in the affairs of men.
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
On such a full sea are we now afloat,
And we must take the current when it serve
...