Martin O’Malley, the former Democratic governor of Maryland and 2016 presidential candidate, says he will not run for president in 2020 and is backing Beto O’Rourke. O’Malley’s endorsement of O’Rourke, who catapulted to the national spotlight in his close Texas Senate race against Sen. Ted Cruz, comes in a column published in the Des Moines Register. […] O’Malley says that O’Rourke has “the wisdom to listen, the courage to lead, and a rock-solid faith in the powerful goodness of our nation.” …