I just got this latest text from the scammers that have been sending relentless texts to me in the past few weeks.

I think in this case the concept is that you are sending a thank you to Kamala Harris? So it's supposed to make you feel like you will be contacting her directly in some roundabout way. So in that case although the text is to you, the thank you they are requesting you sign is to Kamala Harris.

To weed out people who scrutinize the scam. The same reason scams often have misspelled words. They want people who will react quickly without thinking too hard.