WASHINGTON -- Insider trading by members of Congress, their top staff and executive branch officials would be banned by legislation that passed the Senate on Thursday.Although insider trading is illegal for anyone, some had argued that the STOCK Act, which passed 96 to 3, was needed to close loopholes that let lawmakers and lobbyists profit from "political intelligence.""We are entrusted with a profound responsibility to the American people to look out for their best interest, not for our own financial interest," said Sen.