Rep. Henry Waxman, D-Calif. fields a flurry of phone calls in his Capitol Hill office in Washington, Thursday, Jan. 30, 2014, after he announced that he would retire after 40 years in the House of Representatives. Waxman, 74, has been a liberal force in the House, focusing on clean air issues, investigating the tobacco industry, expanding Medicaid and helping to write and enact the 2010 Affordable Care Act. (AP Photo)

Rep. Henry Waxman, D-Calif. fields a flurry of phone calls in his Capitol Hill office in Washington, Thursday, Jan. 30, 2014, after he announced that he would retire after 40 years in the House of Representatives. Waxman, 74, has been a liberal force in the House, focusing on clean air issues, investigating the tobacco industry, expanding Medicaid and helping to write and enact the 2010 Affordable Care Act. (AP Photo)