PHILADELPHIA - Republican mayoral candidate Sam Katz kicked off his campaign Thursday as the man who narrowly defeated him four years ago, incumbent Democrat John F. Street, marked the one-year anniversary of a program to shut down open-air drug markets. Katz, speaking to about 100 supporters outside a South Philadelphia restaurant, said the city had lost "momentum" and was having continued population loss, business woes and problems with its schools. "I am running to end the cronyism, the cynicism and the secrecy inside City Hall," Katz told the crowd. He accused Street of practicing "the politics of division and confrontation"...