Still, some gun-control advocates say Obama could do more than talk. "We believe that on a few very specific fronts they can do more to crack down on bad-apple gun dealers, the very small percentage of gun dealers who sell almost every crime gun in the U.S.," said Dan Gross, president of the Brady campaign. "The ATF has the power to crack down on them and pull their licenses if they are responsible for business practices that wind up causing gun crime and gun violence." The White House could also lead a national conversation on the public health and safety...