STATELINE - Although he will face Thailand's Terdsak Jandaeng for the vacant WBO Interim featherweight title Saturday at MontBleu Outdoor Sports Pavilion, Mexico City's Juan Manuel Marquez has learned to temper his enthusiasm.And for good reason.Possessing a record of 44-3-1 with 33 knockouts, former featherweight champion Marquez could easily make the argument that he has had a tougher time with boxing's various politics than he has had with his opponents.During Prince Naseem Hamed's reign atop the featherweight division, Marquez was ranked No. 1 by the WBO and was the sanctioning body's mandatory challenger to Hamed for well more than a …