The poll shows Donald Trump and Hillary Clinton each earning 45 percent among likely voters. | Getty Poll: Trump, Clinton tied in Ohio

Donald Trump and Hillary Clinton are tied in Ohio, according to a poll conducted this week prior to the final debate between the two presidential candidates.

The Suffolk University poll of 500 likely voters found Trump and Clinton each earning 45 percent. There was little support for third-party candidates: Gary Johnson, the former New Mexico governor running in most states as a Libertarian but listed on the ballot in Ohio as unaffiliated with a major party, earned just 2 percent. Green Party nominee Jill Stein was at 1 percent, as was independent Richard Duncan.

Five percent of likely voters were undecided, and 1 percent refused to respond to the question.

The poll was conducted Monday through Wednesday, prior to Wednesday night’s debate in Las Vegas.

In the previous Suffolk poll conducted five weeks ago, Trump had a 3-point lead over Clinton, 42 percent to 39 percent.

Clinton tied Trump despite significant headwinds. Clinton was viewed less favorably by likely voters in the poll (37 percent), compared with Trump (40 percent). And a 53-percent majority of voters expressed disapproval of the way President Barack Obama has handled his job, while only 40 percent approved of Obama’s job performance.

Trump led Clinton among white voters, 52 percent to 36 percent. But Clinton had a large advantage with nonwhite voters, 80 percent to 13 percent.

Incumbent GOP Sen. Rob Portman continued to hold a significant advantage over Democrat Ted Strickland in the Senate race. Portman led Strickland, 46 percent to 31 percent, with a combined 6 percent supporting other candidates, and 17 percent undecided or refused to reply.

Portman won support from 77 percent of Trump voters, but Strickland won fewer than 6-in-10 Clinton voters, 59 percent. Portman captured 17 percent of Clinton voters, but Strickland was only luring 6 percent of Trump voters.

The poll has a margin of error of plus or minus 4.4 percentage points.