LINCOLN — Thirteen Nebraska state lawmakers visited Washington, D.C., on Tuesday. The White House had considered talking to lawmakers in small groups about it but didn’t. The conference featured cabinet secretaries, White House senior staff and people working for various federal agencies and departments. The White House pressed Indiana state lawmakers about redistricting during a visit to the nation’s capital last month. Another hurdle for any Nebraska redistricting push: Republican lawmakers in the officially nonpartisan Legislature might lack the numbers needed to make the change.