translate English to French: Unsuccessful in his first attempt to win the leadership in 1971, he became a serious contender in 1974 when party leader David LEWIS lost his seat while Broadbent's own majority increased enormously.
En 1971, il perd sa première course à la chefferie du parti mais, en 1974, il devient un candidat sérieux lorsque David LEWIS, le chef du parti, perd son siège et que E.Broadbent devient largement majoritaire dans sa circonscription.