Pennsylvania’s Cuban rum run got its start in a chance meeting last fall in the parking lot in front of the state Capitol. “‘You know, we have rum,’” a visiting Cuban government liaison told state Sen. Chuck McIlhinney, who was walking to his car when he was introduced to her as the senator whose committee oversees how alcohol is sold in Pennsylvania. “And I’m like, ‘Yeah, we should buy some.’” A few months later, the agency that controls Pennsylvania’s 600-plus state-owned wine and liquor stores is working to lift the United States’ 55-year-old embargo on Cuban rum, one of the...