Are you serious? You do realise that the only reason you've gotten to read this article was because someone leaked the negotiating draft, right?
While lobbying groups have had direct access to the negotiations, it took someone violating confidentiality for journalists to even be able to tell you what's being discussed.
If senator's phone lines were crammed-full of citizens demanding knowledge of the negotiations, then the citizens would get that knowledge. But they don't. No one cares or even knows about this.
When the executive negotiates without Congress's participation, citizens don't get a say in the process. We don't get to review the agreement, or pressure our representatives into changing or rejecting it. However, special industry groups do, including the RIAA, as advisors to USTR.
If they wanted it, yes.