RICHMOND — Longtime Arlington lawmaker Mary Margaret Whipple said Friday on the Senate floor that she will not run for re-election.

“It was not an easy decision to make,” she said. “I [love] being in the Senate, and certainly it’s been such an honor to be here and to be the Democratic Caucus Chair, in a way I do feel like a Mother Hen to the caucus, so I’m going to miss that very much,” she said.