Speaker Paul Ryan (R-Wis.) on Wednesday celebrated his recent discovery that he has Jewish ancestry. “Guess I need to start saying ‘L’Chaim’ now, too!” Ryan tweeted, along with a gif of him toasting with a glass of Guinness. The clip was from a toast Ryan gave during an annual Friends of Ireland luncheon, using the Irish toast “sláinte.” Ryan discovered his Jewish heritage during an upcoming episode of the PBS show “Finding Your Roots.” Host Henry Louis Gates Jr. told Ryan during the show that about 3 percent of his DNA is Ashkenazi Jewish, and that he traced the ancestry...