Baltimore's running game ranks 17th in the NFL despite the presence of Pro Bowl running back Ray Rice, who has topped the 100-yard rushing mark only three times (compared to six times last year). Rice led the NFL in yards from scrimmage in 2011.
Flacco, meanwhile, has been erratic while operating the no-huddle attack and has showed little improvement from a year ago.
Maybe things will change under Caldwell. That's Harbaugh's hope, anyway.
"The move was made because it gives us a chance to be the best we can be. It's just an opportunity to try to get this thing going," he said. "We feel like it's what's best for the team at this time. So that's why we made the move. There's nothing more to it than that."
Flacco has committed pivotal turnovers in the last two games, but those defeats can be attributed heavily to the defense. Two weeks ago, the injury-riddled unit couldn't stop Pittsburgh Steelers third-string quarterback Charlie Batch in a 23-20 loss, and the Redskins moved downfield rather easily during a beat-the-clock touchdown drive in the waning minutes of regulation.
Cameron, 51, went 1-15 as head coach of the Miami Dolphins in 2007 before being chosen by Harbaugh to run the Baltimore offense. The Ravens made the playoffs in each of his previous four seasons, and under his direction Flacco became the team's career leader in passing yards, touchdowns and completions.
Harbaugh worked as an assistant coach for Cameron in 1997 at Indiana. After taking over for Brian Billick in Baltimore, one of his first moves was to hire Cameron.
"There is a very human side to this. Cam is my friend, he taught me a lot about coaching, and he is an outstanding coach," Harbaugh said. "Personally, this is the hardest thing I've ever had to do as a coach. Cam has been a significant contributor to all of our successes over the past four, almost five, seasons. Deservedly, he is highly-regarded, and we owe thanks to him for what he did for the Ravens."
In other news, Harbaugh said injured linebackers Terrell Suggs (torn right biceps) and Ray Lewis (torn right triceps) could return Sunday. Harbaugh described guard Marshal Yanda's sprained right ankle as "somewhat serious" but not a break.
Online: http://pro32.ap.org/poll and http://twitter.com/AP_NFL