A source familiar with the situation said the Raiders are expected to sign free agent quarterback Daunte Culpepper today. With the No. 1 pick in the NFL draft, the Raiders signed JaMarcus Russell, who is 6-foot-5 and in the 250-pound range. Culepper is the only quarterback on the market with comparable size, at 6-foot-4 and a listed weight of 265 pounds. Coach Lane Kiffin confirmed Sunday night Culpepper was being brought in for a workout. He also said the Raiders had already seen Culpepper recently.