Let's see the CAPM explain this

From Slate:

The nonpartisan Center for Responsive Politics recently performed the Herculean task of determining which members of Congress own what stocks. Its reports, which you can browse here, are an enthralling psychofinancial portrait of political America. For example, it turns out that oil giants BP and ExxonMobil as well as tobacco/food company Altria are overwhelmingly favored by Republicans, while Democrats are heavily into tech stocks such as Sun Microsystems, Texas Instruments, and Vodafone, the British-based mobile-phone giant.