 He stood again in the 1934 Lowestoft by-election, losing by 1,920 votes to the Conservative candidate, Pierse Loftus.Sorensen was elected as MP for Leyton West at the 1929 general election, defeating the sitting Conservative MP James Cassels by a majority of 2,153.When Labour split at the 1931 general election, Sir Wilfrid Sugden retook the seat for the Conservatives with a majority of nearly 10,000.