Tariffs are advertised in the name of helping American workers, but what do you know? They turn out to favor the powerful and politically connected. That’s the main message of President Trump’s decision to exempt smartphones and assorted electronic goods from his most onerous tariffs. Customs and Border Protection (CBP) late Friday issued a notice listing products that will be exempt from Mr. Trump’s so-called reciprocal tariffs that can run as high as 145% on goods from China. The exclusions apply to smartphones, laptop computers, hard drives, computer processors, servers, memory chips, semiconductor manufacturing equipment, and other electronics. The CBP...