More of Hillary Clinton's supporters said they would consider voting for Donald Trump (9 percent) than Trump backers who say there is a chance they would vote for Clinton (1 percent). | Getty Poll: Clinton, Trump tied in Ohio

CLEVELAND — A poll conducted over the first three nights of Republicans’ national party convention here shows Hillary Clinton and Donald Trump deadlocked in the race for Ohio’s 18 electoral votes.

The survey, from Suffolk University, shows the candidates tied with 44 percent each, with 11 percent of likely voters undecided. It’s the latest in a series of public surveys this month to show a tied race: Polls from Quinnipiac University and NBC News/Wall Street Journal/Marist also showed the candidates running evenly.

Clinton does have a small lead, 42 percent to 38 percent, in a follow-up question in the Suffolk poll that includes Libertarian Party nominee Gary Johnson and Green Party nominee Jill Stein.

Clinton’s favorable rating (41 percent) is marginally higher than Trump’s (38 percent). And far more voters expect Clinton (53 percent) to win the election than think Trump (32 percent) will win.

But there also are alarming signs for Clinton: More of her supporters said they would consider voting for Trump (9 percent) than Trump backers who say there is a chance they would vote for Clinton (1 percent).

In the state’s closely watched Senate race, incumbent Republican Sen. Rob Portman has a slight advantage over Democratic challenger Ted Strickland, 37 percent to 33 percent. But 23 percent of likely voters remain undecided in that contest.

The poll was conducted July 18-20, surveying 500 likely voters. The poll has a margin of error of plus or minus 4.4 percentage points.