Campaign finance reform : hearing before the Subcommittee on the Constitution of the Committee on the Judiciary, United States Senate, One Hundredth Congress, second session, on S.J. Res. 21, a joint resolution proposing and amendment to the Constitution of the United States relative to contributions and expenditures intended to affect congressional and presidential elections, S.J. Res. 130, a joint resolution proposing and amendment to the Constitution of the United States relative to limiting campaign expenditures, and S.J. Res. 166, a joint resolution proposing and amendment to the Constitution of the United States relative to contributions and expenditures intended to affect congressional, presidential and state elections, March 17, 1988