If you caught the injury report this morning, you likely saw Calais Campbell's name present and thought about how the Cardinals will try to replace him should he not be able to go on Sunday. They already re-signed Ronald Talley to place at the defensive end position. They have veterans in Nick Eason and Vonnie Holliday that can take more snaps than they are accustomed to. And they have second year man David Carter as well.
Apparently, that isn't enough to fill the huge void Campbell would leave behind.
That is why Arizona worked out former Bears 3rd round pick Marcus Harrison on Wednesday, per Adam Caplan:
Former Bears 3rd round pick (2008) DT Marcus Harrison worked out for the Cardinals this week. Was most recently with the Patriots.— Adam Caplan (@caplannfl) November 14, 2012
Harrison, as Caplan notes, most recently played with the New England Patriots, but he never saw a regular season snap with them. The last time he did was back in 2010 with the Bears.
Pro Football Focus graded him very negatively when he saw extended snaps in 2009. He lacks skill in defending the run and was given a -11.6 grade. As a pass rusher, they gave him a -6.9.
Also of note is that Harrison comes from a 4-3 background. Maybe he would be a better fit as a 3-4 DE, but does the 6'3", 310 pound tackle have the skillset to play on the end and contain the edge? If the Cardinals sign him, they may have faith that he can do just that.