THEIR OWN WORST ENEMIESGOPers rebel against their own leadership on an Obama-sponsored tax cuthttp://www.nytimes.com/2011/12/03/us/politics/payroll-tax-exposes-rift-in-house-republican-caucus.htmlHouse G.O.P. Is Split on Extension of Payroll Tax Cuthttp://news.firedoglake.com/2011/12/02/senate-republicans-reject-their-own-payroll-tax-cut-bill/Senate Republicans Reject Their Own Payroll Tax Cut