Kamala Harris's presidential campaign is quietly building out its national footprint. The California Democrat has taken a more methodical approach than some rivals in amassing ground troops. On Tuesday, Harris' team will take another step, launching a national training program designed to harness volunteer energy on the ground that it could later tap into, according to a preview of the plan shared with POLITICO. **SNIP** Harris, who piloted her online program in Iowa under the banner of "Camp Kamala," will put volunteers through one or two sessions a week as part of its national effort to train future precinct captains...