Edward M. Mezvinsky, a former congressman from Iowa, was sentenced to more than 6 1/2 years in prison Thursday for defrauding business associates, friends and family -- including his mother-in-law -- of millions of dollars. U.S. District Judge Stewart Dalzell rejected a plea for leniency from Mezvinsky, who blamed his actions on his manic-depression and the side effects of an anti-malaria drug that he took on trips to Africa. "Whatever impairment Mr. Mezvinsky may have had -- and I am dubious in the extreme about that -- it simply did not contribute to the ... crimes which took place over...