By Mike Allen (@mikeallen; mallen@politico.com) and Daniel Lippman (@dlippman; dlippman@politico.com) HAPPY Friday! Valentine’s Day is Sunday. The Gridiron Club emails members: “Gov. Nikki Haley of South Carolina will be the Republican speaker at the Gridiron Club’s 131st anniversary dinner on March 5, President Doyle McManus announced ... Haley, mentioned as a possible Republican vice presidential choice, joins the two Democratic speakers, twin brothers Julian and Joaquin Castro, and Vice President Joe Biden, who will represent the administration.” GLENN THRUSH takeaways from PBS’ #DemDebate in Milwaukee: “Clinton did very little to arrest Sanders’ momentum, although she effectively contrasted her command of granular policy with his vague-ish appeals to liberal outrage.