DES MOINES, Iowa — An Iowa tea party group on Wednesday replaced a billboard comparing President Barack Obama to Adolf Hitler and Vladimir Lenin, calling the sign a bad decision that reflected poorly on the organization. Workers papered over the sign in downtown Mason City at the request of the North Iowa Tea Party. “We got it covered up first thing this morning,” said Kent Beatty, the general manager of the company that owns the billboard.The roughly 200-member tea party group had the original sign put up last week. It showed photographs of Obama, Nazi leader Hitler and communist leader Lenin beneath the labels “Democrat Socialism,” “National Socialism,” and “Marxist Socialism.” After the billboard drew sharp criticism by other state and national tea party leaders, members of the local group sought the change. North Iowa Tea Party co-founder Bob Johnson said he and other leaders agreed with critics that the image of Obama between Hitler and Lenin was offensive. He said the images overwhelmed the intended message of anti-socialism.