Since 1973, NCHLA has maintained a list of Key Votes on Abortion for both the U.S. Senate and the U.S. House of Representatives. A second list of Key Votes on Assisted Suicide exists only for 1999 in the House.
Congressional districts for the U.S. House of Representatives are adjusted every ten years. Some representatives may have served in more than one district. In all cases, votes are linked to Members' names, and Members' names are linked to their current or most recent district.