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Of course, there are other reasons that political families do well, including some positive ones. The Kennedys and Clintons are a good example--when smart people marry other smart people and then raise a family of other smart people--with a bit of initiative all of those smart people may pursue politics in order to accomplish their goals. That can be a good thing for the country.
For God's sake. Accomplish their goals. Who cares about the goals of the nepotistic elite other than the nepotists? And how is that "a good thing for the country"? I find it remarkable how so many people reflexively use language like "accomplish their goals," as if the interests of the unwashed masses are, at best, secondary.