'The party of the left behind' captured Dayton/Montgomery County, Ohio in 2016

But just barely, as you'll see below.

How the G.O.P. Became the Party of the Left Behind.  (The New York Times, 1/27/2020)

Shawn Hoskins used to vote Democratic down the line. For the son of a lifelong Teamster, “it was the way I was raised — it was the way it should be,” he said. And after he went to work on the assembly line at General Motors’ Moraine Assembly plant in suburban Dayton, “I had a job and was in the union and liked the way things were going.” 

But in 2008, G.M. closed the Moraine plant. At 42, with two toddlers, Mr. Hoskins found himself unemployed. As his fortunes soured, his politics changed: In 2012, for the first time, he voted for a Republican presidential candidate, Mitt Romney.

Source:  Wikipedia (Montgomery County, Dayton)

Dayton is the county seat of Montgomery County.

Source:  U.S. Census Bureau QuickFacts

54% of Montgomery County's Blacks live in Dayton.

% of population 25 and older with bachelor's degree:

• 27.4% - Montgomery County
• 27.8% - Ohio
• 30.9% - U.S.

% of population 65 and older:

• 18.0% - Montgomery County
• 17.1% - Ohio
• 16.0% - U.S.

% of population living in poverty:

• 16.9% - Montgomery County
• 13.9% - Ohio
• 11.8% - U.S.

Since 1992, it's been a close call in Montgomery County.

Source:  Wikipedia 

3rd party votes:  18.7% in 1992, 8.7% in 1996. 5.4% in 2016

(George Wallace received 12.7% of the vote in 1968)

Dayton Metro Library