Henderson was first elected to the
House of Commons at the
1923 general election, as Member of Parliament (MP) for the
South Wales seat of
Cardiff South. He lost his seat at the
1924 general election to the
Conservative Arthur Evans, but won it back at the
1929 general election. When Labour split at the
1931 election over
Ramsay MacDonald's formation of a
National Government, Henderson was one of the many Labour MPs to lose their seats. Evans was re-elected, and held the seat until the
1945 election, when he lost to future Prime Minister
James Callaghan. Henderson returned to Parliament at the
1935 general election, for the English constituency of
Kingswinford in Staffordshire. He held that seat until its abolition for the
1950 general election, when he was elected for the new seat of
Rowley Regis and Tipton, on the other side of
Dudley. He was re-elected in Rowley Regis until his retirement from the Commons at the
1966 election. He was created a
life peer on 27 May 1966 as
Baron Rowley, of
Rowley Regis in the County of Staffordshire. He died two years later, the day after his 75th birthday. ==In government==