Every politician just has to ...

Every politician just has to remember how he got his position in the first place. A young candidate running for Congress or any outsider interested in public office could only achieve his goals by relying on soft power. They could not force anyone to vote for them. They needed to convince their potential voters, they needed to do fundraising, they needed to be attractive candidates.
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 Joseph Nye

Quotes from the same author

As we think of power in the 21st century, we want to get away from the idea that power’s always zero sum — my gain is your loss and vice versa. Power can also be positive sum, where your gain can be my gain.
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 Joseph Nye
Power is the ability to affect others to get the outcomes you want, and that can be done by coercion, payment or attraction.
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 Joseph Nye