Former Democratic Senator, and presidential candidate, Gary Hart on HuffPost:

It will come as a surprise to many people that there are rules in politics. Most of those rules are unwritten and are based on common understandings, acceptable practices, and the best interest of the political party a candidate seeks to lead. One of those rules is this: Do not provide ammunition to the opposition party that can be used to destroy your party’s nominee. This is a hyper-truth where the presidential contest is concerned.

By saying that only she and John McCain are qualified to lead the country, particularly in times of crisis, Hillary Clinton has broken that rule, severely damaged the Democratic candidate who may well be the party’s nominee, and, perhaps most ominously, revealed the unlimited lengths to which she will go to achieve power. She has essentially said that the Democratic party deserves to lose unless it nominates her….

If Mrs. Clinton loses the nomination, her failure will be traced to the date she voted to empower George W. Bush to invade Iraq. That is not the kind of judgment, or wisdom, required by the leader answering the phone in the night. For her now to claim that Senator Obama is not qualified to answer the crisis phone is the height of irony if not chutzpah, and calls into question whether her primary loyalty is to the Democratic party and the nation or to her own ambition.