Actually, they do. Please read Article I, Section 8 of the Constitution.
The financial consequences of this thing actually having gone through would have been truly massive.
It will go through in one form or another.
It's a question of whether it goes through in the form of a national DNC list, or a nationwide vigilante movement that firebombs telemarketers.
Which one do YOU prefer?
If you don't want to be called, just do some fairly simple things and problem will be solved.
I did all those things, AT MY OWN F***ING EXPENSE, and the calls ended...for about a month.
And then the telemarketers modified their systems to defeat my countermeasures.
LOL.
Yes, and these modifications ought to be treated as legally equivalent to lock-picking for the purpose of trespassing.
Spam should be treated the same way -- send all the e-mail you like, but do not use any techniques that can be definitively identified as measures designed to defeat anti-spam filters. That would end the problem without even remotely infringing on free speech.