Monday morning greeted DFL Party Chair Mike Erlandson and Senate Majority Leader Roger Moe (DFL-02, Erskine) with the information that Dayton Hudson Heir Millionaire and former State Auditor Mark Dayton (DFL-MN) was entering the DFL field to challenge US Senator Rod Grams (R-MN). Dayton’s last political foray resulted in a fourth-place finish in a field of five in…