Senator Grassley’s side business in childhood psychiatry

From this article on conflicts of interest in medicine comes a hum-dinger of bad writing. I’ll defer to Josh for a more syntactically informed analysis and just point out that the most natural reading of the following sentence has “he” referring to Senator Grassley rather than Biederman, the intended referent:

In June, Senator Grassley revealed that drug companies, including those that make drugs he advocates for childhood bipolar disorder, had paid Biederman $1.6 million in consulting and speaking fees between 2000 and 2007.