Floridians for a Fair Shake and 13 other groups around the country are funded and coordinated out of a single office in Washington, with the goal of battering Republicans for their health care and economic policies during the midterm elections. At the center of the effort is an opaquely named Democratic organization, the Hub Project, which is on track to spend nearly $30 million since 2017 pressuring members of Congress in their districts. The great bulk of its funding has come from so-called dark money - funds from donors who are not legally required to reveal their names. With that money, the Hub Project ... set up an array of affiliate groups around the country, many with vaguely sympathetic names like Keep Iowa Healthy, New Jersey for a Better Future and North Carolinians for a Fair Economy. The Hub Project then used them to mobilize volunteers and run advertising on policy issues against Republican members of Congress many months before the election. Several Democratic operatives involved in the group likened its role to that of Americans for Prosperity, the conservative advocacy network funded by the billionaire Koch brothers ... on a significantly smaller scale. Mr. Gerney, the group's executive director, said in an interview that the initiative targeting several dozen congressional districts had been designed to keep the focus on the Republicans' legislative agenda in an election heavily dominated by ... personality. He described it as a test case.