CNN) — The nation's largest labor conglomerate says it's set to launch a major effort Tuesday to dispel ongoing rumors surrounding Barack Obama that continue to percolate more than 18 months after the Illinois senator launched his White House bid.

The organization is set to send out mailers to more than 600,000 union homes in crucial battleground states — including Ohio, Michigan, Pennsylvania, and Wisconsin — that directly address the false rumors that he is not a Christian, refuses to wear a flag pin on his lapel, and was not sworn into the Senate on the Bible.

It also beats back claims the Democratic presidential candidate was not born in America and refuses to put his hand on his heart during the Pledge of Allegiance. (view the mailer [PDF])

A majority of AFL-CIO's membership is considered part of the working-class demographic — the key voting bloc that overwhelmingly supported Hillary Clinton in the prolonged Democratic primary race and is likely to play a key role in the battleground states this November.