Not all’s well with the Modi juggernaut. The BJP, playing caste in Uttar Pradesh and Bihar, is discovering it can be like quicksand. It was easy to project Gujarat chief minister Narendra Modi as a tall leader, but—dominated as the party is by upper-caste leaders—it’s finding it difficult to zero in on Other Backward Class (OBC) and Extremely Backward Class (EBC) candidates to field in Uttar Pradesh and Bihar.