A version of this story first appeared in CNN Business’ Before the Bell newsletter. Not a subscriber? You can sign up right here.What’s happening: Everyday investors are increasingly excited about legislation in Washington that could dramatically change US marijuana policy. And on Tuesday,Amazon (AMZN) announced its support for the federal legalization of marijuana — indicating a growing willingness in Corporate America to throw its weight behind the issue. In recent days, names like Cronos (CRON), Tilray (TLRY) and Sundial Growers