Members of Congress already get better health insurance and retirement benefits than other Americans. They are about to get better insider trading laws as well. Several academic studies show that the investment portfolios of congressmen and senators consistently outperform stock indices like the Dow and the S&P 500, as well as the portfolios of virtually all professional investors. Congressmen do better to an extent that is statistically significant, according to studies including a 2004 article about "abnormal" Senate returns by Alan J. Ziobrowski, Ping Cheng, James W. Boyd and Brigitte J. Ziobrowski in the Journal of Financial and Qualitative Analysis....