Rocked by regional election defeats and investor dismay at the surprise loss of the central bank chief, India’s ruling party is doubling down on Prime Minister Narendra Modi. Four-and-a-half years after crushing the Nehru-Gandhi dynasty’s latest scion as he swept to victory, Modi still cultivates his image as a diligent, incorruptible son-of-a-tea-seller who strives to make India a prouder, more powerful country.