Statista has more public data than any other statistical resource on the web and grows at an average rate of 500 new stats per day. Statista includes information from more than 10,000 renowned business and public information sources including trade organizations, scientific publications, and government sources on more than 600 industries. Statista also includes more than 3,000 market studies and 1,000 industry reports from Statista's own analysts. The platform can generate customizable graphs in multiple formats from any search results set, that then integrate with presentation and reporting applications such as PowerPoint and Excel.
Data from all U.S. elections (presidential, congressional, and gubernatorial) from 1789-present. National, statewide, and county level data. From the UNC Library & Congressional Quarterly. Download in .xls format.
Presidential, Senatorial, Congressional, and Gubernatorial candidates are covered, as are campaigns and elections, political parties, and voters and demographics. Data can be downloaded and manipulated to cover an individual's career, seat competition, party control, and party switches, among other aspects of American politics. The Collection also includes an encyclopedia, a calendar and chronology, and definitions and sources of the data.
Access data from the Decennial Census (1990 forward), the Economic Census (1997 forward), Annual Population Estimates (2006 forward), Annual Economic Surveys (2003 forward), and American Community Survey data (test data through 2004 and all ACS data from 2005 forward).
Browse their A-Z list for a topic, and expect "redirections." (for instance, from Swimming, they direct you to Healthy Swimming and Recreational Water Home - Healthy Water). From the U.S. Centers for Disease Control and Prevention.