He put his weight behind this bill but the 'Master Negotiator' couldn't sell it to his own team. Every account of the health care fiasco describes Trump as having zero idea what the bill even did. All he did was give pep talks about how important it was to pass the bill, he never made a single argument for why this bill was a good idea.
Contrast this with Barry being all in on Obamacare, traveling the country, consulting with both parties, making televised speeches about it.