Posted by ESPN.com's Bill Williamson
There are two draft picks by AFC West teams in the fourth round that I really like.
The Raiders' selection of Murphy takes away some of the sting of Oakland's decision to draft Darrius Heyward-Bey over Michael Crabtree at No. 7. Murphy is a steady player who many scouts I've talked to believe can develop into a strong player. He has good size and speed and he a chance to have a long career.
I see him working his way into Oakland's receiver rotation quickly. He is a good insurance policy for the Raiders if Heyward-Bey takes a while to develop.
They didn't need to speed big money on a tailback in the draft. Johnson is great value. He is a powerful, down-hill runner. He will be a perfect change-of-pace back working with Tomlinson and Sproles.
With Tomlinson nearing the end of his career, Johnson will get a chance to be a feature back if he shows himself well as a rookie. For a fourth-round pick, this choice made a lot of sense.