Democrats supported TPP because it pushed environmental and labor protections into countries not otherwise interested in them. It did some (not enough - but then we are dealing from a position of weakness so some was all we could hope for) to contain China and quite a bit to protect IP.
Trump was against it because the Dems were for it. The only constant in todays GOP is "if Dems are for it we are against it!" they have no other postion on anything they will actually keep. The morons who voted for hair furor knew nothing of the agreement, only that they had been feed a line of shit by radio & TV talkers spewing the Republican line. They got suckered but we knew that was going to happen.
Now that it is too late, now that TPP is fucked up Dump wants to come crawling back to it. And those same talkers will tell the morons this reversal is all Obama's fault & they will eat it up because apparently they love to eat shit