Capps began his career in the late 1950s as a news anchor for KTHV, the Columbia Broadcasting System affiliate in Little Rock, Arkansas. He then moved to radio, working as a news announcer, DJ, and station manager at KWCB in Searcy, Arkansas. He later started his own radio stations, KAPZ and KKSY. In November 1962, Capps was elected to the Arkansas House of Representatives as a Democrat at the age of 28, making him one of the youngest representatives at that time.
In 1982, he was elected Speaker of the House.
In 1998, after 36 years of legislative service, he left the House due to term limits, which had recently been enacted by Arkansas voters. In 2002, Capps re-entered politics, running for the Arkansas State Senate, District 29 (parts of White, Pulaski, and Faulkner counties) and was elected, subsequently winning re-election in 2006.
While in the legislature, he served on a number of committees, including the Legislative Council. Rules and Regulations.
Joint Audit; and Revenue and Taxation.
He also chaired several committees: Transportation, Technology, and Legislative Affairs. Advanced Communications and Information Technology. Economic and Taxation Policy.
And the Blue Ribbon Committee on Highway Finance.
Capps worked on a number of initiatives, including a reform of the General Improvement Fund, which had previously encouraged legislators to treat the fund as a pork barrel. In 2005, the Arkansas Sierra Club called Capps a "hero for Arkansas" future" because his environmental voting record was adjudged the best in the Senate.
In 2007, Capps sponsored legislation to create a non-profit organization, Connect Arkansas, intended to expand the state"s broadband coverage for health, education, and other economic development projects.