Portman has significant lead in polls.
Focus centers on alleged history of housing discrimination.
GOP nominee will speak at Roberts Centre in Wilmington.
Clinton’s Ohio staff much larger; Trump banks on enthusiasm.
Vice president will visit Youngstown area, Cleveland.
Democrat speaks at UAW Local 12.
He appears with supporters from United Auto Workers.
Candidate promises ’a new American future’ during rally.
Republican candidate also calls for investigation into Clinton
Democratic candidate willing to add 4th one here.