MANCHESTER (AP) — At a campaign stop in Manchester yesterday, Democratic Presidential hopeful John Kerry told an audience of college students he opposes federal prosecutions in medical marijuana cases in states that have legalized the practice, pledging to reverse Bush administration policy on the issue. More broadly, he said he wanted to wait for the completion of a study to see what other alternatives might be available to medical marijuana before deciding whether to legalize it in all states. Asked whether he would repeal federal law that denies federal student loan assistance for individuals convicted of drug offenses, he said...