GOP, Democrats push different versions of extension of payroll tax cut.

First attempt to extend break fails amid disagreement on how to cover costs.

First attempt to extend break fails amid disagreement on how to cover costs.

Debate on Capitol Hill shifts to how to cover costs of extending break.

Debate on Capitol Hill shifts to how to cover costs of extending break.

Business group says Rep. Camps proposal could hurt U.S. companies.

Proposal includes equal amounts of spending cuts, tax hikes.

Rep. Camps plan would create broad exemption for profits earned overseas.