As ESPN.com gave out their list of the 10 greatest running backs of all-time, it brought up the question: which active running backs could one day wind up in Canton? Let's take a look at some possibilities.

Can Make A Case Right Now

LaDainian Tomlinson, San Diego Chargers: The no-brainer of the group. Tomlinson is already 18th on the all-time rushing list, with 10,650 yards. LT is 3rd in all-time rushing TD's with 115, and with 9 more, he'll rank second on the list. His 129 total TD's are 7th all-time.

Edgerrin James, Arizona Cardinals: Edge has somewhat quietly had a superb career. He is 13th on the all-time rushing list, and he could very easily get to number 7 on the list, passing players like Marshall Faulk and Jim Brown on the way. He is also in the top 20 all-time in rushing TD's.

Fred Taylor, Jacksonville Jaguars: The longtime Jacksonville back is an interesting case. If he stays healthy, he'll wind up in the top 15 all-time in rushing yards. But he's just 35th in all-time rushing TD's, and 76th in total TD's. Not to mention his lone Pro Bowl appearance. So though he is a longshot, he should at least be discussed.

Shaun Alexander, No Team: There's no doubt Alexander benefited from running behind Walter Jones and Steve Hutchinson for many years in Seattle, but he was a great runner in his own right. Still without a team this season, Alexander is 25th in rushing yards in NFL history, and 7th in rushing TD's.

Maybe, If They Keep It Up

Clinton Portis, Washington Redskins: Something that may surprise people is that Portis is just 26 years old. And his numbers for that age are outstanding - with a solid year, he will rank in the top 30 all-time in rushing yards, and with 8 more rushing TD's, he'll be in the top 25 all-time in that category.

Steven Jackson, St. Louis Rams: Granted, this is solely based on projection, but at the age of 24, and his skill set, Jackson has a lot of upside. If he rushes for about 1,400 yards this season, he'll be in the top 80 in all-time rushing yards, and 9 rushing TD's (no small feat), he'll be in the top 100 in that statistic.

Larry Johnson, Kansas City Chiefs: Johnson is probably the longest shot of any of these players because he got off to such a late start. At 28 years old, LJ needs a few phenomenal years from here on out to have a realistic chance. However, he does have 50 rushing TD's in his career, and he can quickly move up the list, as he currently sits 55th all-time.