(DATE REFERENCE IN LAST GRAPH) On the day President Bush signed into law new corporate accountability legislation, the issue is heating up Minnesota's political landscape. DFL Senator Paul Wellstone and GOP challenger Norm Coleman today (TUESDAY) traded charges that each is accepting contributions -- directly or indirectly -- from firms under investigation for accounting irregularities. The finger-pointing comes as Coleman begins a two-day swing through northern Minnesota to promote his views on natural resource management. Minnesota Public Radio's Michael Khoo reports.