Gingrich Takes On Custodians and New York Reacts Romney Says His Tax Rate Is "Probably" 15 Percent Under renewed pressure to release his personal income tax returns, Mitt Romney on Tuesday acknowledged that he pays an effective tax rate of about 15 percent. Debates can seem defined by spontaneous moments, but behind the scenes, Fox News left little to chance. Critics of Gov. Scott Walker say they have collected nearly twice as many signatures as required to recall him and force a new election. With five days remaining before the South Carolina primary, the Republican challengers wasted little time firing pointed questions at Mitt Romney during Monday night's debate in Myrtle Beach. As Jon M. Huntsman Jr. quit the Republican presidential race and endorsed Mitt Romney, Newt Gingrich and Rick Santorum vied for the support of divided conservatives. January 17 Obama Campaign Looks Into Ad Rates The Obama campaign could be close to putting its first commercials on television. Sean Bielat, a Republican who ran an aggressive race against Representative Barney Frank in 2010, said Tuesday that he would again seek the seat in Massachusetts' 4th Congressional District. Republicans will cast votes disapproving of the increase, but they cannot block it under a deal cut last summer. The Republican presidential debate focuses for a fleeting moment on cleaning New York City schools. Paul to Break From Trail for Debt Ceiling Vote Ron Paul is taking a day out of presidential campaigning on Wednesday to return to Washington to vote against an increase in the nation's debt ceiling.