President Obama’s campaign is recruiting young people active on social media to promote the president’s response to Mitt Romney’s “47 percent” remarks. The social media campaign is aimed at young people between the ages of 18 and 29 and builds on a new TV ad and radio ad running in swing states that highlights Obama’s stated desire to be “president for all,” a direct response to the video taken of Romney at a private fundraiser in May that was released this week. Romney told supporters in Florida that his “job is not to worry” about the 47 percent of Americans...