U.S. mayors meeting in New York Tuesday called for tougher laws to combat gun violence, saying they will have to lead the way. The New York Times reports the meeting was organized by New York Mayor Michael Bloomberg and Boston Mayor Thomas Menino. "It is time for national leadership in the war on gun violence, and if the leadership won't come from Congress or come from the White House, then it has to come from us," Bloomberg said. "When Congress does not take the lead on a major problem that affects the whole nation -- whether it's global warming, welfare,...