As I watched Donald J. Trump campaigning, I thought, I've seen this show before. It was in the 1990s in Bombay (now called Mumbai). And the man playing the Trump part was Bal Keshav Thackeray, the leader of the Hindu nationalist Shiv Sena party, who rode to power on a wave of outrageous stories, bluster, lies, bigotry and showmanship. He died in 2012 after ruling -- and ruining -- the city I grew up in. The road to understanding Mr. Trump might just lie through understanding Mr. Thackeray, and what became of Bombay, writes Suketu Mehta for the New York Times.  Do read