In his acceptance speech at the Democratic National Convention in September, President Barack Obama singled out Minnesota's Marvin Windows and Doors for inspiration on how to weather a tough economy. "The family business in Warroad, Minnesota that didn't lay off a single one of their four thousand employees during this recession, even when their competitors shut down dozens of plants, even when it meant the owners gave up some perks and pay -- because they understood their biggest asset was the community and the workers who helped build that business -- they give me hope," Obama said. But the inspiration, apparently, is not mutual. At a Twin Cities airport rally Sunday with GOP vice presidential nominee Paul Ryan, a member of the Marvin family took the stage to endorse Mitt Romney. "Job creation is core to the Romney-Ryan team," said Susan Marvin, president of Marvin Windows. "Business is not the enemy. Business creates jobs." Obama has called out to Marvin Windows before, although it is well-known that that the family generally supports Republicans, having given GOP candidates tens of thousands of dollars over the last several years.