By KATHY GANNON MAZAR-E-SHARIF, Afghanistan (AP) — A powerful warlord in northern Afghanistan and a key U.S. ally in the 2001 defeat of the Taliban blames a fractious Afghan government and an “irresponsible” American departure for the insurgents' recent rapid territorial gains across the north. Ata Mohammad Noor, who is among those behind the latest attempt to halt the Taliban advances by creating