The AFL-CIO is planning to have activists knock on 640,000 doors over the weekend in 23 states.

The AFL-CIO will have its members out knocking on doors early this year to counter the Republican National Convention in Tampa.

The nation’s largest labor federation is planning to knock on 640,000 doors in 23 states over the weekend for a massive canvassing campaign. Labor unions have traditionally begun their political efforts on Labor Day, but are starting a week early to coincide with the GOP convention.

Joining in the canvassing effort will be and Workers’ Voice, the AFL-CIO’s super-PAC. Workers’ Voice will also be sending out direct mail to 240,000 senior citizens taking direct aim at Mitt Romney, the presumptive Republican presidential nominee, and his vice presidential pick, Rep. Paul Ryan (R-Wis.).

AFL-CIO President Richard Trumka said the union ground game would help Democrats and President Obama win the election this fall.