After being shown up on the world stage by Russia and the Palestinian Authority, among others, an embattled White House conceded Monday it erred by not sending more prominent U.S. officials to a historic unity rally in Paris over the weekend. The embarrassing admission came as political pundits, lawmakers and other critics hammered the Obama administration for its almost-invisible presence at the Sunday march, which drew more than 1 million people to honor the victims of last week’s terrorist attacks and to support freedom of expression. While Russian Foreign Minister Sergey Lavrov, Palestinian President Mahmoud Abbas, Israeli Prime Minister Benjamin Netanyahu and a host of other world leaders and top government officials were able to make it to Paris, the U.S. sent only Ambassador Jane Hartley and Assistant Secretary of State Victoria Nuland