The lobbying group has more than doubled its spending on political campaigns, while rarely mentioning Israel. It has placed a large financial bet on today’s Michigan Senate primary. In less than five years, the American Israel Public Affairs Committee has become one of the biggest spenders in American elections, flooding the airwaves in congressional races across the country. Since its first involvement in elections, the amount of money AIPAC-affiliated political action committees have spent on campaign advertising and outreach to voters has more than doubled, from $29.3 million to $67.2 million, with much of it spent in Democratic primaries. The...