depends on what the spam contains; if it contains

• a reference to the content of the text message that the OP received
• a kindly worded paragraph describing how much we appreciate their political activism
• a kindly worded paragraph explaining the dark patterns of politics (e.g., using psychological manipulation)
• a kindly worded paragraph requesting that the donor write to their PAC and ask them to stop using their money for dark patterns
• an offer for them to become an independent, White MAGA instead of Blue MAGA or Red MAGA
• thank them again for their political activism

then probably not criminal