Virginia Sen. Tim Kaine said Monday he was saddened by the “senseless act of gun violence” at Ohio State University, even though the attacker used a butcher knife and a car. Mr. Kaine, who ran on the 2016 Democratic ticket with presidential nominee Hillary Clinton, was accused of pushing a gun-control agenda after his Twitter post blaming firearms for the siege. Eleven people were injured in a rampage by Somali-born student Abdul Razak Ali Artan, who drove into a crowd on a sidewalk and then chased bystanders with a knife in what is being investigated as a possible act of...