No group that I know of.
That’s what you really have to watch out for because most of the ‘volunteers’ and/or caretakers us the impaired elders as just another means to vote for themselves.
An impaired voter is allowed to have someone help them at the polls. I used to work as a poll clerk and I saw multiple examples of it. One, a young adult man with severe Downs Syndrome who couldn’t function and interact normally was taken into the booth and basically his black caretaker executed the ballot while he was just sitting silent in the wheelchair.
That worker probably voted her choices several times that day. In this instance the patient was rolled out with a happy face that beamed and he yelled “I voted!” and was so proud. All I could do was shake his hand and say, “Congratulations!” and pop an “I voted sticker” on his chest. And the caretaker rushed out for another vote.