The United Transportation Union and the International Association of Machinists and Aerospace Workers have backed her.

ECONOMIST: But still worth courting

The company also faced labor challenges last year with disputes with the airlines' two largest unions, the International Association of Machinists and Aerospace Workers.

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Tom Buffenbarger, president of the International Association of Machinists and Aerospace Workers, said that given the financial turmoil, it was "remarkable" that the 3, 000 current and laid-off workers represented by the union will still have retirement benefits.

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But a previous publisher, Harrison Gray Otis, so angered labor leaders with his opposition to unions that John McNamara of the International Association of Bridge and Structural Iron Workers dispatched his brother James to blow up the Times building in 1910.

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Members include: ACORN, AFSCME, Americans United for Change, Campaign for America's Future, Center for American Progress Action Fund, MoveOn.org, National Council of La Raza, National Education Association, Planned Parenthood Federation of America, Service Employees International Union, United Food and Commercial Workers, and USAction.

NPR: Profile: Health Care for America Now