I'm no broker or a trader but...the above sounds like something that would get the SEC's serious attention if it were pulled by...oh...let's say...a Donald Trump.
It might be legal but doesn't seem fully above board.
I think the best scenario would be for these demonrats to outbid the hell out of him substantially raising the stock price, then Elon sells it all at a profit while simultaneously crashing the stock price causing the outbidders to lose substantial money.
Reminded me of a scheme my friend used to do in college where he would donate one cent to the DNC which would cause the DNC to spend money and resources on mailings to thank him for his donation and ask for more donations