Associated Press: John McCain toured a nuclear power plant yesterday, the first such visit in recent history by a presidential candidate and one that highlighted the promise and peril of a technology central to reducing reliance on foreign oil. The Enrico Fermi Nuclear Plant outside Detroit, named for the first physicist to split the atom, is home to both an operating power plant and another reactor that had a partial meltdown in the 1960s. It was decommissioned in 1972, while its successor continues …