Rep. Upton has received significant donations from the oil and gas industry, more so since he became chairman of the powerful House Energy and Commerce Committee. His efforts in Congress have definitely helped these special interests, putting their profits ahead of his constituents’ health.
His constituents have noticed. And there has been a tremendous backlash against his efforts.  
Faced with this criticism, Rep. Upton has felt compelled to respond through OpEds like this one (although his arguments were quickly debunked by the NRDC here).
Perhaps it’s a coincidence that he’s doing this after being so strongly criticized for supporting special interests. But I don’t think so.