|                                     |                        Opinion | Wednesday, April 29, 2015 |                  |                                                       |       THOMAS B. EDSALL       Enter Scott Walker, Stage Right      In his nascent presidential campaign, the Wisconsin governor wants to position himself as a deeply conservative alternative to Jeb Bush and Marco Rubio.     |  |                  |                                                       |       Op-Ed Contributor       From Saigon to America              By BICH MINH NGUYEN                  They gathered us up. They filled a knapsack with clothes and food. And then we left our home for good.     |  |                  |                                                       | Opinion on Facebook »       Connect with columnists, readers and influential thinkers. Join the conversation around the day's biggest issues.     |  | Nicholas Kristof's Newsletter       Sign up to subscribe to receive emails from Nicholas Kristof about each column and other occasional commentary.     |  |      |