Sabotaging GOP primary could pay off down the campaign trail
                                
                                
                                    (Newser) -
                                    Left-wing netroots tastemaker Markos Moulitsas Zúniga is endorsing Mitt Romney in next week’s Michigan primary. You read that right. In Michigan's open primary system, any registered voter can cast a Republican ballot, and the blogger calls for strategic sabotage. With the Democratic race uncontested, the Michigan left can...