NASHVILLE — The organizers of the National Tea Party Convention on Friday unveiled plans for a July conference and a political group that they ambitiously predict will raise $10 million to help conservative candidates around the country dedicated to the small-government ideals of the tea party movement. The group, Ensuring Liberty Corp., is a nonprofit that will do direct marketing and organizing and will eventually be accompanied by a political action committee arm of the same name that will contribute directly to candidates. Its group’s president, Mark Skoda, presented it, during a news conference jam-packed with national and international press,...