In 1876, he was elected as a Republican to represent Iowa's 5th congressional district in the United States House of Representatives. He was re-elected two years later. However, on April 29, 1879, near the beginning of the first session of his second term, he died suddenly on the floor of the House, reportedly suffering an attack of meningitis.[2] He was interred in Oakland Cemetery in Iowa City.
Personal life
He married Eugenia Orr (died April 27, 1867), who was a teacher who died giving birth to daughter Eugenia Clark Pomeroy. A previous son, Eugene Rush Clark, had died during birth in 1865. Clark married again in a few years, and to this union, several more children were born, of which two lived.