Candidates in the fourth congressional district took the stage at the College of St. Catherine's in St. Paul Thursday, to debate domestic issues from higher education to the dealth penalty. D-F-Ler Betty McCollum, Republican Linda Runbeck and Independence Party candidate Tom Foley are running to replace Congressman Bruce Vento, in an unpredictable three-way race that has attracted national attention. Despite the high stakes, the tone of the debate was polite, with the candidates only rarely questioning one another on their respective records. Minnesota Public Radio's Amy Radil reports.