I seem to recall hearing about something like that, MM, but I don’t recall what it is. I did a search on bing. The link below is one of the 1st ones that came up. It looks like it doesn’t always happen that way but American League often means Pubbie and National League means Dim. Cubs are in the National League.
http://americanhistory.about.com/od/elections/a/baseballpres.htm