WASHINGTON--The largest health care labor union in the United States, the Service Employees International, is using its 2.2 million members' hard-earned dues to finance an intense, expensive lobbying campaign in support of the pending health-insurance bill - in order to prop up its failing pension plans.

It spent a significant fraction of its 2009 lobbying budget of $2.7 million on health, purchasing costly ads in major newspapers and on TV, such as one telling Indiana Representative Brad Ellsworth, a Democrat, "to keep standing up for us, not the insurance companies. Pass health insurance reform now."

The union's president, Andy Stern, who is desperately committed to enactment of the bill, is reported to have been the most frequent visitor to the White House over the past...