texas-sized ramifications of the ruling with law professor richard hasen and political reporter shira toeplitz. >> woodruff: then, gwen ifill updates us on the tightening g.o.p. presidential race, one day before the south carolina primary. >> may hinge on the decisions on the state's most conservative voters. >> suarez: plus we'll have analysis from mark shields and david brooks. >> woodruff: from our colleagues at wisconsin public television, we have an update on the effort to recall governor scott walker. >> all of this was set in motion a year ago when governor walker and the republicans passed a bill that removes most collective bargaining >> suarez: and margaret warner looks at the federal shutdown of one of the world's most popular online sites, the file-sharing web site megaupload.com. >> woodruff: that's all ahead on tonight's newshour. major funding for the pbs newshour has been provided by: bnsf railway. and by the alfred p. sloan foundation. supporting science, technology, and improved economic performance and financial literacy in the 21st century. >> and with the ongoing support o