This comes just one year after the Broncos signed Keenum from the Minnesota Vikings on a two-year contract. In his lone season with the Broncos, they went 6-10, which led to the firing of head coach Vance Joseph. They then went out and acquired veteran quarterback Joe Flacco from the Baltimore Ravens, which signaled the end of Keenum's time as their starter. Keenum admitted at the time that he was "shocked" and "disappointed" by the move.
The Redskins made this move with the uncertainty of how Alex Smith will recover from his broken leg that he suffered last season. It was thought to be a career-ender, but he is now on track to return to the football field at some point, but the timetable is still one big question mark. Smith had to undergo multiple surgeries for the injury due to multiple infections.
He is considered a long-shot to play in 2019, which is where Keenum comes in, with Colt McCoy being the only other quarterback currently on the roster. The Redksins have also been talked about to acquire Josh Rosen from the Arizona Cardinals, but that is if they selected Kyler Murray from the Oklahoma Sooners with the top pick in the NFL Draft. This past season with the Broncos, Keenum threw for 3,890 yards with 18 touchdowns and 15 interceptions, which was tied for second in the entire league. His Total QBR also finished in the bottom 10 of the NFL, so a fresh start at a new place is probably best for the QB