.......... 
This is why:
Michelle Goldberg on Sarah Palin:
Is She a Narcissist?: On Thursday, CBS News had a small scoop.... After McCain’s chief strategist, Steve Schmidt, rejected a request by Palin to reply to a report that her husband, Todd, had been a member of the secessionist Alaska Independence Party, Palin came forward with a preposterous excuse.... Secession, she insisted—despite all available evidence—is not part of the party’s platform, and besides, Todd “was only a 'member' bc independent alaskans too often check that 'Alaska Independent' box on voter registrations thinking it just means non partisan. He caught his error when changing our address and checked the right box. I still want it fixed." A clearly exasperated Schmidt wrote back that secession is the AIP’s “entire reason for existence. A cursory examination of the Web site shows that the party exists for the purpose of seceding from the union. That is the stated goal on the front page of the Web site. Our records indicate that Todd was a member for seven years. If this is incorrect then we need to understand the discrepancy. The statement you are suggesting be released would be inaccurate.”
Despite such rebukes, and her punchline status in much of the country, Palin’s self-conception appears undiminished.... Her seemingly irrational faith in herself might not be totally misplaced, especially if other Republicans keep self-destructing at their current rate. That’s because while Palin is unhinged, so is much of her competition. Politics has always attracted the deeply screwed up, but our current political system seems to do so more than most. Perhaps that’s because healthy people looking to make their mark on the world don’t want to subject themselves to the inquisitorial media attention or crushing vapidity of modern campaigning.... Success in our politics often requires a voracious, antinomian egotism, a sense that rules are for others.
The Alaska governor shares the personality flaws of many of her male peers, but by all accounts she doesn’t express them via the preferred method of politicians like John Edwards or Mark Sanford—by being sexually reckless. The United States has grown more blasé about sex scandals post Bill Clinton, but they remain more damaging than, say, dishonesty, greed, or naked incompetence.
Palin may have gone rogue on John McCain, had public feuds with her grandson’s teenage father, turned on loyal aides, flubbed interviews, spent tens of thousands of dollars of other people’s money on clothes, and told countless lies, but as far as we know she hasn’t cheated on her husband. If congenital narcissists dominate our politics, Palin may be just the narcissist the GOP needs.
