So what I'm getting today is that honoring a pledge is more important than what the pledge represents?
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It has always been my view that this fascination with "Pledges" started by Grover Norquist, I believe, has done much to erode the confidence of the American electorate in their political leaders. At one time a politician was elected based on his character, we elected the candidate not for his view on a particular issue but because we could trust him to do the right thing whatever the issue in the future.
Today some demand a contractual relationship with their politicians which is really kind of silly in my view. I'd far rather elect a politician who will do the right thing when an issue presents itself than a self serving politician thinking he's going to violate some pledge he signed and won't get reelected...