Mayock says Browns need to take Trent Richardson

The top three picks in the draft are expected to be Andrew Luck (Colts), Robert Griffin III (Redskins), and Matt Kalil (Vikings). The Browns pick fourth, and G.M. Tom Heckert stopped well short of tipping his team’s hand in a Thursday afternoon pre-draft presser. NFL Network’s Mike Mayock held a pre-draft conference call of his…