Agence-France Presse: US lawmakers on Tuesday rejoined pitched political battles over health care, climate change, and the increasingly unpopular war in Afghanistan after a month-long August break from Washington. US President Barack Obama hoped to set the agenda immediately with a rare speech late Wednesday to a joint session of the Congress to revive prospects for his top domestic priority — remaking US health care. And Obama, whose job approval ratings have slid sharply since he took office in …