Republican nominee Donald Trump is beating Democratic challenger Hillary Clinton by 2 points in the latest presidential poll.

Red Oak Strategic, a Virginia-based data analyst company, said Trump was the choice of 35 percent of those polled compared to 33 percent for Clinton. The results are within the poll's margin of error, meaning the two are tied in a virtual dead heat.

Libertarian presidential nominee Gary Johnston was at 8 percent; 24 percent said they were supporting another candidate or were unsure.

The poll was performed Sept. 15-16 among 915 likely voters with a 3.5 margin of error. It marks the first time a Red Oak Strategic poll has found Trump leading Clinton nationally since August.

Battleground states

The tightening national race is being played out in 13 battleground states that have the business mogul-turned-politician and former Secretary of State locked in a tie.

A CBS News Battleground Tracker poll issued Sunday has Trump and Clinton tied at 42 percent across 13 battleground states. The same poll gave Clinton a 1 point advantage last week.

The poll showed 52 percent of voters in the battleground states of North Carolina, Pennsylvania, Arizona, Colorado, Florida, Georgia, Iowa, Michigan, New Hampshire, Nevada, Ohio, Virginia and Wisconsin want to see "big changes" in the nation's politics and economy. Forty-three percent said they would like to see some changes made and 2 percent think the country is fine the way it is.

Forty-seven percent of those polled said Trump would be the best candidate to make big changes while only 20 percent said the same for Clinton.

Clinton leads among voters who said they thought she could best handle the day-to-day job of the presidency, beating Trump 47 percent to 39 percent. Among Democrats, 86 percent said the country would be "damaged beyond repair" if Trump wins; 83 percent of Republicans felt the same way about a Clinton presidency.

The poll was conducted among 4,202 registered voters. The margin of error is 1.9 percentage points.