Webster’s New World College Dictionary defines quid pro quo as something for something; one thing in return for another; something equivalent, or a substitute.
Additional definitions are: Something given or received for something else; a deal arranging a quid pro quo.
Synonyms: back and forth, barter, trade, swap, dicker, exchange, or trade off.
In politics, nobody does something for nothing, or a quid pro quo.
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In politics, voting for or against a proposal in exchange for a campaign contribution is a quid pro quo.
Almost everything is Washington, D.C., is a quid pro quo.
Understanding the above should lead one to evaluate whatever is said or done by a politician as suspect, wondering what each one wants in return.
Richard L. "Bud" Phillis