with lester holt good evening i m savannah guthrie in for lester. tonight, the impassioned calls for change in this country, from the uvalde teacher, the lone survivor of his classroom among 11 dead students, to a grieving son of buffalo in a hearing room on capitol hill to the white house briefing room where this afternoon the actor and uvalde native matthew mcconaughey made a surprise appearance, eulogizing the dead in heart wrenching detail, down to the green high tops the only identifying marker left for one little girl, so ferocious the wounds from the gunman s ar-15. for a moment the nation was captivated. rare roadblock coverage on cable news we have been here many times. tonight, bipartisan momentum appears to be growing for some change to the nation s gun laws what s on the table and will it make a difference nbc s gabe gutierrez leads us off reporter: tonight as the u.s. grapples with the dramatic surge in gun violence, relatives of those killed in the buffalo m