India’s ruling Bharatiya Janata Party (BJP) is bracing for a fiercely contested state election in Bihar starting on Thursday, in a race analysts say could determine the stability of Prime Minister Narendra Modi’s coalition and reveal the limits of his influence in key battleground states. Voting in Bihar will take place in two phases, on Thursday and next Tuesday, with results due next Friday. The outcome will not only decide Bihar’s leadership but could also set the tone for a series of key...