Walking along the crumbling sidewalk that lines his New Birth Ministry congregation in Duquesne, Pastor Jim Nelson greets Dr. Mehmet Oz with a hardy handshake and a pat on the back as Oz exits his SUV. “I’d really like to take you for a little ride in the neighborhood before we get started with today’s roundtable,” the former police officer-turned-faith leader told the Republican candidate for Senate. Without hesitation, Oz piles into the pastor’s van, and they head up the steep brick Pennsylvania street that has long served as the major artery of this Mon Valley city overlooking the Monongahela River. WATCH: BYRON YORK CALLS FETTERMAN ATTENDANCE RECORDS 'DAMAGING' Once a booming steel town of 21,000 and the home of the mighty Duquesne Works, the majority-black population has shrunk to 5,100. The median household income...