This type of thing goes on all the time in politics. If you have a winning team in place during the campaign... why not bring them in to help govern?
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Because they may be capable of helping elect you, but not of governing. They're two very different skills.
Often, the people who helped get a politican elected become a major source of trouble for him when they're brought in to help him govern. Booker is treading on thin ice, and ought to be careful, especially in the virtually communistic one-party system that exists in Newark.