Failed gun legislation is the norm after mass shootings

After the deadliest school shooting in nearly a decade, lawmakers are making emotional pleas for stricter gun control legislation. "What are we doing?" an impassioned Sen. Chris Murphy (D-Conn.) said on the Senate floor on Tuesday after an attack at a Texas elementary school killed at least 19 children and two adults.

The big picture: There's a familiar pattern. In the wake of a mass shooting, Congress zeroes in on gun and other relevant legislation, but Republicans won't support most new gun laws and Democrats don't have 50 senators who are willing to ditch the filibuster to take a majority vote.

• The mass shooting in Buffalo, New York, less than two weeks ago, also brought legislation on domestic terrorism and guns into sharp focus for lawmakers.