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"In some ways, Clinton has kind of picked up the old Obama vote, obviously among African-Americans, because African-Americans were strong for Obama last time, and now they're strongly for Clinton said Kyle Kondik, managing editor of Sabato's Crystal Ball, the University of Virginia Center for.
The Ohios steel industry has been in decline for decades, leaving many workers feeling left behind by globalisation.
Several political analysts and insiders said they expect Clinton to win Ohio on March 15, given her win in the 2008 Democratic primary here and polls showing her leading Bernie Sanders.
"If the African-American vote is high, that is very likely to benefit Hillary Clinton said University of Akron political scientist John Green.
Clinton's campaign has been reaching out to rural areas as well - last week, Bill Clinton made a point of campaigning for his wife in Chillicothe as well as Columbus and Dayton.
Most students at those schools are from Ohio, so many of them will still vote from their hometowns, Kondik said.
Pennsylvania: latest polls, joseph Lake, head of forecasting at the Economist Intelligence Unit, says: Ohio has been a bit of a bellwether for the last few decades.
But can the Republican billionaire still win in the crucial swing state of Ohio?