As part of the marketing of Elena Kagan's nomination for the U.S. Supreme Court, the White House is trotting out some graduates of Harvard Law School to vouch for Kagan, who served as dean before going to work as Barack Obama's solicitor general. A conference call Tuesday morning will feature three recent graduates talking about her support for public service -- including a Texan described by the White House as a Republican political consultant, Sarah Isgur, class of 2008. She's not exactly Karl Rove, but it turns out that Isgur has a rather surprising political pedigree for someone willing to...