Opal Covey, the candidate for mayor of Toledo newly declared as a Republican, has done some research and concluded that Democrats have nearly destroyed Toledo. She picked 1967 as the start of the city's decline because, according to her, that marked the end of Republicans being in power in Toledo.
That was the last full year that Republican John Potter was mayor. Other than Republican Mayor Donna Owens (1984 to 1990) and current independent Mayor Mike Bell (2010 to present), all the mayors since January, 1968 have been Democrats.
By the way, Opal's voter registration file shows that she was registered as a Democrat as recently as 2012 when she pulled a Democratic ballot in the primary.
Here's Opal Covey's bumper sticker: