The AFL-CIO's executive council gave final approval to a plan to deploy at least 400,000 union members to work on the re-election of President Obama.
The GOP-led House on August 1 rejected extending Democratic-proposed tax cuts for the middle class.
The governing council of the union's campaign finance committee, or PAC, backed Smith's comment and added Romney is unacceptable so far, too.
The Fire Fighters, one of the most politically active unions - and one that is plurality Republican - formally endorsed Democratic President Barack Obama.
The anti-union measure would have nullified NLRB rules that consolidate legal hearings regarding the union votes and shortening the time period for employers' appeals.
It was a corporate double-cross 50 years ago that produced one of President John F. Kennedy's most famous lines.
The AFT, like a number of other unions, had already endorsed President Barack Obama before this meeting.
As might be expected in a presidential election year, politics will take center stage when the AFL-CIO Executive Council meets.
The party cleavage was stark in the GOP-run House last year on key votes. Unions use the AFL-CIO figures as part of their evaluations when deciding, locally, whether to support or oppose an incumbent lawmaker.
Even the jobless benefits bill, which both parties agree upon, is hung up by a partisan dispute over how to pay for the $150 billion measure.