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>TPP felt to me one of the issues that really defined the Trump campaign and the voters it appealed to.

It also helped define Trump's campaign because like a lot of issues his stance on it had little relation to the actual facts. TPP had plenty of problem that made it overall a bad agreement. Opposing it was generally smart. However, there was no indication that such a deal would have harmed the US economy. There is also wide consensus among economists that free trade benefits the nation at large. It isn't the fault of the economists that this country does a bad job of sharing the benefits of such deals with the entire population.