Oct. 5, 2016 – When the history  of the 2016 election is written, one of the central points is likely to be how  little voters knew about the donors who influenced the contests. At the federal  level, some groups aren't required to disclose their donors and can spend  unlimited amounts on political advertising.1
So who are these groups running  ads on television and radio and filling our mailboxes with literature? Let's do  a little research.
The Federal  Elections Commission's Disclosure Portal
  The Federal Elections  Commission's (FEC) Disclosure Portal features one-stop shopping for campaign  finance data. 
The Hot Topics section is broken  out into four subheadings:
  - Presidential  Elections (with finance summaries, statements of candidacy, matching submissions,  and "select reports"); 
- House and  Senate Elections (with expenditure maps);
- Super PACs  (expenditures); and 
- Candidate  and Committee Viewer (search for a candidate or committee).
The Campaign  Finance Institute
  The 50 State Policy Interactive  Policy Tool "will let you experiment to see how a few changes might alter the  balance of money in each of the states." Users choose a state, adjust public  matching funds, adjust participation, and use the "no change" button to view  options individually or combined. On the state's page, basic campaign finance  state law information is available, as well as total contributions to  candidates, state government information, and demographics.
Beth Bland is a tech services librarian at Davis and Kuelthau in Milwaukee. Bland is a current member of the Law Librarians Association of Wisconsin (LLAW), a chapter of the American Association of Law Libraries. LLAW's Public Relations Committee coordinates regular contributions by its members to InsideTrack.
The Center  for Responsive Politics
  The Center for Responsive  Politics' Influence and Lobbying page helps users "to learn more about  Washington's influence industry and its most powerful players." Six sections  are presented, including Industries/Interest Groups, Lobbying, and PACs. In the  PACs section, for example, users can search for a committee, contributions by  and to them broken out by sector and industry, and view actual documents filed  with the FEC.
Wisconsin Campaign Finance  Information Service
  On this site, the public can  search for and view filed reports, receipts, expenses, and candidate  registrations for different state political offices such as governor, attorney  general, and the courts. On the other side of the coin, groups can register  their committee, register a conduit (someone who receives, deposits, and  disburses a contribution at the direction of the contributor), and report  independent expenditures. Links are also available to basic campaign finance  information and forms.
Wisconsin Democracy Campaign
  The website offers a "premier"  searchable database of campaign contributions and candidates for state office.  Searching is available by a simple or advanced option, such as by individual  contributor, specific employer or city/state, or contributions to a specific  candidate. In general, records go back to 1993 and in some cases as far back as  1989.
A campaign is not an election. No  matter how well-financed its advertising, a campaign's success depends entirely  on whether voters "buy" what is being "sold" on Election Day.2 With  a little research, voters can become smart shoppers. 
Endnotes:
1 Lee, Chisun and Norden, Lawrence, "The Secret Power Behind Local Elections," New  York Times, June 25, 2016 (accessed Sept. 7, 2016).
2 Laufer,  Laurence D., Picture This: Campaign Finance  Law and the Question of Values, 43 Seton Hall L. Rev. 1209 (2013).