The killing of a Minnesota lawmaker and her husband sent shockwaves through the political world and appeals from elected officials to turn down heated rhetoric.

The assassination of a Democratic Minnesota state lawmaker and her husband and the shooting of another lawmaker and his wife at their homes are just the latest addition to a long and unsettling roll call of political violence in the United States.

The Minnesota assassination is causing some state legislators to rethink home security and how much personal information they make public.

A manhunt is underway for the gunman who was impersonating a police officer and had a list of possible targets, officials said.

Minnesota state Sen. John Hoffman lived in West Des Moines for nearly a decade and is credited with forming an active Democratic Party there.

One of the debilitating aspects of any violence is how final and definitive it is and how anemic any response to it feels. Capturing and trying the alleged culprit are necessary next steps but nothing unwinds what was done.

U.S. Capitol Police increased security for Klobuchar and Smith following the attacks, which occurred early Saturday morning. Minnesota's entire congressional delegation, both Republicans and Democrats, released a joint statement condemning the killings.

While Washington hosted a military parade, large crowds gathered across the country Saturday to peacefully protest President Donald Trump’s policies. The threat of violence – and news of a political assassination in Minnesota – added to tensions.