A super PAC and a major labor union committed to getting Democrats elected to the House of Representatives have set aside close to $20 million for airtime for ads on television this fall. The ads will air in districts from Florida to Illinois as the Democrats try to reclaim Congress.

Super PAC, House Majority PAC that recently helped the Democrats to hold onto Rep. Gabrielle Giffords’ seat in Arizona, will invest another $16 million and the Service Employees International Union that has 2.1 million active members will spend over $3.7 million for the advertising airtime.

The ads will target 47 different House races that are competitive that include Democrats facing difficult challenges and Republican incumbents who are vulnerable. The Democrats must have a net increase of 25 in order to win the control they lost in the 2010 elections.

This year the spending by campaign committees, outside groups and candidates themselves is certain to break all previous records for an election year that includes the Congress and Presidency at stake. The Supreme Court last week reaffirmed its 2010 landmark decision in the Citizens United case. The case allows an unlimited amount of political donations from labor unions, wealthy Americans and corporations.

The latest ad reserve follows one made earlier in the year by the National Republican Congressional Committee, which reserved over $18 million in airtime to lock in less expensive TV rates to help GOP prospects in 25 districts. Earlier this year House Democrats also reserved ad time to the tune of $46 million.