Final answer:
Hugh Gaitskell was the victor at the Blackpool Party Conference in 1961, where he secured a vast majority in favor of maintaining UK's NATO commitment and nuclear arsenal.
Step-by-step explanation:
The person who emerged victorious from the Blackpool Party Conference in 1961, successfully getting official policy support for NATO and nuclear arms was Hugh Gaitskell.
This conference was a pivotal moment for the Labour Party, where a significant decision concerning the UK's nuclear deterrent and international alliances was made.
Gaitskell was the leader of the Labour Party at the time and managed to secure a large majority in support of his stance to maintain the UK's commitment to NATO and its own nuclear capabilities, with the policy being endorsed by 4.5 million to 1.7 million votes.