Senators overwhelmingly approved a measure Thursday that would postpone Obamacare's unpopular "Cadillac tax," which is a tax on high-end health insurance plans that was meant to help pay the costs of the health law.

The measure, which passed 90-10, is an amendment to a bill that would repeal much of Obamacare. The Senate is expected to pass the repeal measure, after which it will be vetoed by President Obama.

But passage of the Cadillac tax amendment signaled a strong bipartisan desire to get rid of the tax, which is staunchly opposed by employee unions.

"There is no opposition in America to this legislation," said Sen. Dean Heller, R-Nev., the sponsor of the amendment.

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