 The shooter purchased a ladder from a Home Depot. Now, it's unclear if that ladder was brought to the grounds here where the rally is to assist him in getting on to the roof. That part is unknown, but Home Depot did release a statement condemning the shooting on Saturday. The shooter had also visited a gun range just days before. A prominent congressman is reportedly warning about major Democratic losses if President Biden stays on the party's ticket. Here's CBS's Linda Kenyon.