Bill Maher's guests this week will range from Rick Santorum to Wendy Davis. Republican presidential candidate Santorum will be the top-of-show interview on "Real Time With Bill Maher" at 10 p.m. Friday on HBO. A repeat follows immediately at 11 p.m. Journalist Michael Weiss is the second interview guest. The panel will be reporter Robert Costa of The Washington Post, Rep. Dana Rohrabacher, R-Calif., and women's right activist Wendy Davis. Davis, a Democrat who served in the Texas Senate, is a staunch defender of Planned Parenthood.