Senator Tom Harkin, an Iowa Democrat who plays a key role in Congress on higher education issues, has announced  that he will not seek re-election in 2014. Harkin is chair of the Senate's Health, Education, Labor and Pensions Committee and of the appropriations subcommittee for education and health. In those roles, he has been a strong advocate for increased spending on student aid programs and biomedical research. He has been a frequent critic of for-profit higher education, and has backed tougher regulation of for-profit colleges. Harkin said that his proudest legislative accomplishment was having been chief sponsor of the Americans With Disabilities Act, which greatly expanded the rights of people with disabilities in education as well as other parts of society.