SUMMARY Nikki Haley was one of two conservative minority Republicans to post primary wins in South Carolina, thanks to strong backing from tea party voters. Judy Woodruff talks to two political watchers about what those wins mean for the general election. JUDY WOODRUFF: And for more on the primaries and the historical results in South Carolina, we're joined by Amy Walter, editor in chief of The Hotline, "National Journal"'s political daily, and Adolphus Belk Jr. He's a professor of political science and African-American studies at Winthrop University in Rock Hill, South Carolina. He joins us now from Charlotte, North Carolina....