Bob Dole was a FIVE term Senator. When he ran for the Presidency in 1996, he had already completed FOUR years of his six year term. He did not resign from the Senate until AFTER he had won enough delegates from primary contests to SECURE the nomination.
The fact that you try to make some analogy to Bob Dole - not only an announced candidate, but the presumptive nominee - to Sarah Palin, is facially absurd. And, anyone who wasn't a moron, would see it.
Dole, correctly, didn't think it was fair to the people of AK to hold one office, while he was the presumptive nominee of another. Sarah Palin quit her job in 2009 - almost three years before the first 2012 primary, and long before she even officially announced her candidacy. Your argument is specious.
I love how the antiplain idiots try to justify someone else quitting. Palin had her reasons to resign. Very good reasons just like Dole had his reasons. I happen to agree with both their reasons. They both resigned for their own reasons with the voters in mind. Your failure to accept that fact makes you a hypocrite. Deal with that also.