The AFL-CIO says labor's electoral education campaign, often going door to door, has driven down Donald Trump's support among union members.

In June polling the AFL-CIO found support over 40 percent among union members in some battleground states. But labor's campaign has driven down that support to the low-thirties - more of a typical number for Republican support among union members.

The AFL-CIO says Trump is running behind Mitt Romney's numbers when it comes to the percentage of union members planning to vote for him.