The Online Explainers take your question on the investigation.
The NewsHour's coverage of the Congressional Investigation.
The inside stories on the political fight behind the public investigation.
The investigation is big news in Washington, but how's it playing around the country.
A closer look at the issues really under scrutiny by the Congress.
Efforts to investigate the abuses of the campaign finance laws have been slow to develop and frought with political trench warfare. In the past month alone, Senator Thompson faced a proposed walkout by the Democrats on his panel. Only after clandestine meetings between members of panel did Democrats agree to a new series of subpoenas and a few offers of immunity. As the hearings go forward, the members of both the House Government Oversight Committee and the Senate Governmental Affairs Committee will be forced to question colleagues from their own party. The entire investigation will also take place in a full context of presidential and congressional politics.
Here is a look at the stories that have focused on the investigation from the past year:
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