You can't get away with not inviting Sarah Palin:
On the day that Mitt Romney formally announced his run for the presidency last year, he found himself competing with a stiff New Hampshire wind, which stood his hair on end and played havoc with his microphones. What blew in later was even more distracting: the red, white, and blue bus bearing Sarah Palin on her “One Nation” tour. Palin stole the headlines, and Romney’s buzz, that day (“Coincidence,” she said), and beyond. Through much of the summer, she hovered at the edge of the Republican primary campaign as a shadow candidate, once predicting that she could not only beat Romney, but President Obama, too, before finally declaring herself out of the race last fall.
But Palin continued to vex Romney’s candidacy, questioning his conservatism, encouraging the non-Romneys still in the race, and publicly cheering for the prospect of an open convention. Even after Romney clinched the race in late spring, Palin remained pointedly hesitant about the presumed Republican nominee. She has not yet extended to Romney her full endorsement, and, while she speaks animatedly of the urgency of defeating President Obama in November, her support for Romney derives from the fact that Romney meets Palin’s threshold qualification—as “anybody but Obama.”
Every time Palin speaks in public, the albatross she hangs around the necks of Republicans everywhere gets a little heavier. Let's be totally honest, though. The Romney people can get away with not inviting her solely because she has chosen the career path of celebrity rather than leader.
She has to be allowed to whip up her followers and send them off into that good night with fear in their eyes, confusion in their minds, and bile in their throats.