Elon Musk's Tesla and SpaceX lost more than $420 billion in combined market value in the two days after the midterm elections, -. CNBC With Democrats controlling the House and Senate and Texas now in Democratic hands, investors expect Musk and his companies to face tougher investigations and regulatory hurdles to their AI and takeover ambitions. Musk was the biggest supporter and donor to Republican candidates in the midterm elections, and most of those he supported were defeated by Democrats.