How is this even close to legal? I don’t care which political party they are working for, this is dystopian and indicates a completely broken system.
This is how. You’re welcome. 
Grok:
It’s legal for the same reason most prison labor is legal.
The 13th Amendment bans slavery and involuntary servitude except “as a punishment for crime whereof the party shall have been duly convicted.” Courts have upheld compulsory prison work for well over a century under that exception. Inmates are not covered by federal minimum-wage laws, so the $2/hour rate is not illegal.
The Oklahoma Department of Corrections signed contracts with HBW Leads that explicitly authorize “telemarketing and political polling activity.” The DOC has publicly stated that the calls—including advocating for candidates—fall within that contractual language and that the agency reviews the material for compliance with state and federal law. No court, the FEC, or any regulator has ruled otherwise.
Prison labor call centers have operated in Oklahoma (and elsewhere) for years. The political content made this one newsworthy, but the underlying legal framework—13th Amendment exception + contractual authorization + no successful legal challenge—is the same one that has allowed low-paid inmate work programs across the country for decades.
If someone wants to change it, the route is legislation or a constitutional amendment, not pretending the current arrangement is somehow outside the law.
*
And they also call for insurance companies. Luigi! Where you at! 