With no conflicts of interest or insider knowledge.
Per CNBC, members of Congress make “market crushing” investment returns.
http://www.cbsnews.com/8301-504803_162-57323518-10391709/confronting-pelosi-on-insider-trading/
Confronting Pelosi on insider trading
The key is a gambit called "pump and dump." The Congresscritter knows in advance what the insertion into the law will be, buys stocks, and watches them jump on the announcement of whatever regulatory or tax dispensation they've crafted.
Awaiting comment from Dick Durbin...