The high cost of prescription drugs has become one of the top political issues this year - candidate after candidate has expressed outrage over senior citizens forced to choose between buying food and buying medicine. It's a key issue In Minnesota's U-S Senate race, with all of the major D-F-L candidates and Republican Senator Rod Grams calling for changes to make prescription drugs more affordable for seniors. In part two of our series Prescription for Change, Minnesota Public Radio's Laura McCallum looks at the Senate candidates' proposals, and whether they're more than just election year rhetoric...