Associated Press: In the end, it was a crush of mud that finally plugged the blown-out well in the Gulf of Mexico, three months after the offshore drilling rig explosion that unleashed a gusher of oil and a summer of misery along the Gulf Coast. The government stopped just short of pronouncing the well dead, cautioning that cement and mud must still be pumped in from the bottom to seal it off for good. President Barack Obama declared that the battle to contain one of the world’s worst oil spills …