Case Keenum wants to show he's the Broncos' answer at quarterback

ENGLEWOOD, Colo. -- Quarterback Case Keenum would like to leave the Denver Broncos' power brokers with the best possible last impression he can muster.

And there's just one more afternoon's worth of football left for that as his Broncos will miss the playoffs for the third straight time since winning Super Bowl 50. The Broncos (6-9) figure to go into the fourth consecutive offseason since Peyton Manning retired with at least some questions about both their short- and long-range plans at quarterback.

Keenum, who turns 31 in February, signed a two-year, $36 million deal last March, a prove-it sort of contract that the quarterback hopes is just the start of a long run in Denver. And Sunday's…