The recent rebound in the US stock market, particularly the S&P 500, has been largely driven by retail investors rather than institutional players such as hedge funds. Since its low on April 8, the S&P 500 has risen approximately 19.7%, marking one of the largest rallies on record if it is categorized as a bear market rally. Retail investors maintained strong long positions at the market bottom in April, while many institutional investors remained cautious, holding cash or short positions. The increased accessibility of online brokers and research tools has empowered retail investors to become the dominant force in equities trading. This shift in market dynamics raises questions about the influence of partisan perspectives among retail investors, especially within the Democratic base.