Which is how he got to be called a flip-flopper.
There is a difference between being a flip flopper and changing your vote based on a change in circumstances. By the time TPA was passed in the House, many Dem amendments had weakened it, while Conservative amendments were not allowed. Then there was the back door dealing being done by McConnell and Boehner to extend the EX-IM bank corporate welfare in exchange for Dem votes. He did the right thing by voting “No”.