nationwide election campaign; national campaign tour
Refers to a political candidate traveling across the country to give speeches and rally support during an election.
The candidate went on a nationwide campaign tour.
The schedule for the nationwide election campaign was announced.
選挙運動 is the general term for election campaigning activities, while 全国遊説 specifically emphasizes traveling across the country to give speeches.
Compound of 全国 (nationwide) and 遊説 (campaign tour, originally meaning 'to go around and persuade').