Rahul Gandhi stood in a red Jeep, amid a churning crowd in Varanasi, trying to unseat the Indian government with a microphone in his hand. “The mic isn’t good,” he said. “Please quiet down and listen.” It was the morning of Feb. 17 — Day 35 of a journey that began in the hills of Manipur, in India’s northeast, and would end by the ocean in Mumbai, in mid-March. In total, Gandhi would cover 15 states and 4,100 miles, traveling across a country that once voted for his party, the Indian National Congress, almost by reflex. No longer, though. For a decade, the Congress Party has been so deep in the political wilderness, occupying fewer than a tenth of the seats in Parliament, that even its well-wishers wonder if Gandhi is merely the custodian of its end.