By Richard Cowan WASHINGTON (Reuters) - Supporters of U.S. immigration reform are hoping that the smooth and drama-free passage of their legislation through a Senate committee - a departure from almost everything that has happened in Congress over the past four years - will boost the likelihood of the bill winning full Senate approval. Even Senator Charles Grassley of Iowa, the senior Republican on the Judiciary Committee who voted against the immigration bill on Tuesday, told Reuters TV that the "very fair" debate by the panel "does improve its chances. ...

By Barbara Liston and Mark Hosenball ORLANDO, Fla./WASHINGTON (Reuters) - A Chechen immigrant who was being questioned about his possible links to one of the Boston Marathon bombing suspects was shot and killed by a federal agent in Florida on Wednesday after he suddenly turned violent, the FBI said. A friend of the dead man identified him to Reuters as 27-year-old Ibragim Todashev, who had previously lived in Boston and knew Tamerlan Tsarnaev, the older of the two brothers suspected of planting two bombs at the marathon on April 15, killing three people and injuring 264. ...