In January, Republican Scott Brown shocked the political world by winning the U.S. Senate seat once held by Ted Kennedy in deeply Democratic Massachusetts.  Could it happen again?  Could a Republican Congressional hopeful knock off a longtime Democrat who has won all re-election attempts by landslides?  What issue is driving this campaign?  And why does GOP hopeful Marty Lamb believe he can emerge from a crowded Republican field and defeat Rep. Jim McGovern in November?  We discuss all these questions with Marty Lamb.