Mocking The Draft has a scouting report on Ilinois's RB Mikel Leshoure. He's described as "the best of the big running backs" and "a surprisingly good pass catcher." Most importantly he's "a more than willing blocker" who is "better than most backs coming out" at it. There are a couple reasons why the Green Bay Packers might consider a running back.
RB Ryan Grant is coming off a major injury, and entering the final year of a four-year contract. He's been with the Packers for four seasons, and dealt with a hamstring injury that held him back in 2008, in addition to the knee injury that wiped out his 2010 season. He's bordering on injury prone, and he'll be 29 years old when he starts his next contract. It might not be a good idea to re-sign him.
RB James Starks received a lot of love during their playoff run. He's certainly got the size and initial burst to be a productive runner, but he doesn't seem very elusive in the open field. I also re-watched the Super Bowl recently, and saw him completely miss on a block which led to a 4th quarter sack by DE Ziggy Hood. He hasn't yet convinced me that he's the featured back of the future.
RB Brandon Jackson was tendered a contract as a (potential) restricted free agent. But he's expected to become an unrestricted free agent, and wants to become a lead back. He also fell out of favor with the coaches late in the season, and Starks took away a lot of his playing time.
I don't think the Packers are in a good position to draft Leshoure. He should be a 2nd round selection, but he won't be available when it's the Packers turn at the end of the second round. I'm not even sure Leshoure should be the guy. But they might want to do something about the position now, before Jackson and Grant have the opportunity to leave.