Illinois Senate Primary Features Millions in Outside Spending, Too

Amid the flood of super PAC spending in four open-seat House primaries in the Chicago metro area, the primary campaign to replace soon-to-retire Sen. Dick Durbin in the U.S. Senate has gotten a bit lost. But super PAC money from corporate interests like the cryptocurrency industry has also characterized that race, along with millions from supporters of the major candidates.

Illinois Democrats will choose their next Senate nominee among Lt. Gov. Juliana Stratton, who has called for Immigration...