Taped from Caminada Bay in Grand Isle, La., on Friday, President Obama warned people in his weekly address to be “prepared for the worst,” even as everyone hopes that BP’s efforts “bring better news than we’ve received before.” “Over the last few days, BP has placed a cap over the well, and it appears they’re making progress in trying to pump oil to the surface to keep it from leaking into the water,” Obama said in the address, taped from Caminada Bay in Grand Isle, La., on Friday. "But as has been the case since the beginning of this crisis,...