John McCain and Barack Obama have spent the past week talking up their energy plans. But the toll on Americans' pocketbooks from the high costs of fuel have forced both candidates to change their stances on a number of policies. Steve Henn reports. TEXT OF STORY Kai Ryssdal: John McCain and Barack Obama aren't taking any chances on lower oil prices. The two have spent most of the past week praising the virtues of their energy plans and panning the other guy's. If some of what you're hearing from them this time around strikes you as new, that's because it is. Marketp...