Donald Trump and Hillary Clinton are in a tight race in Iowa, according to a new poll.

{mosads}Trump, the Republican nominee, is favored by 43 percent of respondents while Clinton is backed by 42 percent, according to a survey by Simpson College and RABA Research, a bipartisan polling firm.

In a four-way matchup, Trump also leads his Democratic counterpart by 1 point, 40 to 39 percent. In that matchup, Libertarian nominee Gary Johnson is supported by 10 percent and Green Party nominee Jill Stein is backed by 3 percent of voters.

Another 8 percent are undecided.

The poll finds 57 percent of respondents said they are voting “for” their candidate, but 41 percent are casting a ballot to vote “against” a candidate.

Trump has a lead over Clinton among Iowa evangelicals, 56 to 25 percent, according to the poll. Clinton has an advantage among Iowa voters who attended college, 42 to 36 percent.

The poll was conducted from Sept. 6 to 8 among 1,054 Iowa voters.

According to the RealClearPolitics average of polls in the state, Trump has roughly a 1-point lead over the Democratic nominee, 42.3 to 41.5 percent. Several polls conducted in August show a tight race in the state.