2016 Postmortem

https://ballotpedia.org/The_Trans-Pacific_Partnership_trade_deal:_Public_opinion_on_TPP_and_TTIP

From the above:

"The Trans-Pacific Partnership (TPP), a 12-nation trade deal, has been a major issue in the 2016 presidential and congressional elections; however, multiple polls show that many Americans are unsure what the trade deal is and whether it would be good or bad for the country.

"HIGHLIGHTS

"An August 2016 Morning Consult (MC) poll revealed a slight increase in support for the TPP and a slight increase in voters' knowledge of it since MC's March 2016 poll; however 62 percent of those polled still said that they know "not much" or "nothing at all" about the 12-nation agreement.

"A March 2016 Morning Consult poll found that only 24 percent of Republicans, who have historically supported free trade, support the TPP, while 34 percent oppose the deal.

"A March 2016 Pew Research Center poll found that of voters supporting Hillary Clinton (D), Bernie Sanders (D), Ted Cruz (R), John Kasich (R), and Donald Trump (R), all of whom were still candidates for president at the time, Clinton's supporters were the most supportive of free trade. Fifty-eight percent of Clinton's supporters said that free trade is a "good thing," and 31 percent said it is a "bad thing." Trump's supporters expressed the most negative opinions about free trade deals. Only 27 percent said that free trade is a "good thing," and 67 percent said it is a "bad thing.""

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Sure seems this might have been a hugely important issue in the election - e.g., in Michigan, Ohio