The alliance between Gandhi and the Khilafat faction did not last long, and the campaign of resistance proved less effective than hoped, as India's institutions continued to function. Jinnah sought alternative political ideas, and contemplated organising a new political party as a rival to the Congress. In September 1923, Jinnah was elected as Muslim member for Bombay in the new Central Legislative Assembly. He showed much skill as a parliamentarian, organising many Indian members to work with the Swaraj Party, and continued to press demands for full responsible government. In 1925, as recognition for his legislative activities, he was offered a knighthood by Lord Reading, who was retiring from the Viceroyalty. He replied: "I prefer to be plain Mr Jinnah."In 1927, the British Government, under Conservative Prime Minister Stanley Baldwin, undertook a decennial review of Indian policy mandated by the Government of India Act 1919.  The review began two years early as Baldwin feared he would lose the next election (which he did, in 1929). The Cabinet was influenced by minister Winston Churchill, who strongly opposed self-government for India, and members hoped that by having the commission appointed early, the policies for India which they favoured would survive their government. The resulting commission, led by Liberal MP John Simon, though with a majority of Conservatives, arrived in India in March 1928. They were met with a boycott by India's leaders, Muslim and Hindu alike, angered at the British refusal to include their representatives on the commission.  A minority of Muslims, though, withdrew from the League, choosing to welcome the Simon Commission and repudiating Jinnah.  Most members of the League's executive council remained loyal to Jinnah, attending the League meeting in December 1927 and January 1928 which confirmed him as the League's permanent president. At that session, Jinnah told the delegates that "A constitutional war has been declared on Great Britain. Negotiations for a settlement are not to come from our side ... By appointing an exclusively white Commission, [Secretary of State for India] Lord Birkenhead has declared our unfitness for self-government."Birkenhead in 1928 challenged Indians to come up with their own proposal for constitutional change for India; in response, the Congress convened a committee under the leadership of Motilal Nehru.[1] The Nehru Report favoured constituencies based on geography on the ground that being dependent on each other for election would bind the communities closer together. Jinnah, though he believed separate electorates, based on religion, necessary to ensure Muslims had a voice in the government, was willing to compromise on this point, but talks between the two parties failed.  He put forth proposals that he hoped might satisfy a broad range of Muslims and reunite the League, calling for mandatory representation for Muslims in legislatures and cabinets. These became known as his Fourteen Points. He could not secure adoption of the Fourteen Points, as the League meeting in Delhi at which he hoped to gain a vote instead dissolved into chaotic argument.After Baldwin was defeated at the 1929 British parliamentary election, Ramsay MacDonald of the Labour Party became prime minister. MacDonald desired a conference of Indian and British leaders in London to discuss India's future, a course of action supported by Jinnah. Three Round Table Conferences followed over as many years, none of which resulted in a settlement.  Jinnah was a delegate to the first two conferences, but was not invited to the last.  He remained in Britain for most of the period 1930 through 1934, practising as a barrister before the Privy Council, where he dealt with a number of India-related cases. His biographers disagree over why he remained so long in Britain—Wolpert asserts that had Jinnah been made a Law Lord, he would have stayed for life, and that Jinnah alternatively sought a parliamentary seat. 

Question: When did Jinnah win an election?
Answer: September 1923