Crawfurd made several unsuccessful attempts to enter the British Parliament in the 1830s. His campaign literature featured universal suffrage and the secret ballot, free trade and opposition to monopolies, public education and reduction of military spending, and opposition to regressive taxation and the taxation of Dissenters for a state church, with nationalisation of Church of England properties. He joined the Parliamentary Candidate Society, founded by Thomas Erskine Perry (his brother-in-law), to promote "fit and proper" Members of Parliament. He also joined the Radical Club, a breakaway from the National Political Union founded in 1833 by William Wallis.