Part of the rise of Donald Trump has been attributed to his tapping into the anxieties of working class voters, but a new poll shows Democratic front-runner Hillary Clinton leading among middle class voters in Rust Belt states. Forty-six percent of those surveyed in the Bloomberg poll said they would vote for Clinton while only 39 percent would vote for Trump, the presumptive GOP Republican nominee . The poll also showed that 43 percent of voters felt Clinton would fight harder for the middle class compared to 29 percent of those who said Trump would. [ Poll: Two-Thirds of Trump Backers Think Obama Is Muslim ] The poll, conducted online by Purple Strategies, interviewed 803 likely voters who earn between $30,000 to $75,000 in Michigan, Ohio, Wisconsin and Pennsylvania. It had a margin of error of 3.5 percentage points. The poll comes on the heels of the AFL-CIO launching an anti-Trump ad campaign directed at working-class voters. Contact Garcia at EricGarcia@cqrollcall.com and follow him on Twitter @EricMGarcia . Get breaking news alerts and more from Roll Call on your iPhone or your Android.