While the bill had been proposed by Republican Senators Rick Santorum and Mel Martínez, it also had the support of Democratic Senator Tom Harkin due to disability rights concerns in the Schiavo case. Harkin had worked with disability rights groups for years and co-authored the 1990 Americans with Disabilities Act. American disability rights groups traditionally tend to ally themselves with Democrats and the political left; however, in the Schiavo case, they joined pro-life organizations in opposing the removal of her feeding tube and supporting the Palm Sunday Compromise. According to Marilyn Golden, Harkin's support was necessary for passage of the bill, as any voice opposition by Democrats would have delayed it.