Jason Anderson is leading the rush to replace the retired Ryan Dungey at the top of the Monster Energy Supercross series, which comes to AT&T Stadium in Arlington on Saturday.Dungey retired last year shortly after winning his third consecutive title in the 450 SX class. Anderson leads the series through six events by 28 points over Justin Barcia.Anderson, of Rio Rancho, N.M., has won the last two races and four of the last five.