Labour's party conference on Tuesday is expected to pass a motion which will commit to campaigning for a people's vote, if there is no option of a general election available.
Mr Watson's comments came as a poll for The Observer found 86% of Labour members think voters should have the final say on the outcome of Brexit negotiations, and 90% would now vote to remain in the EU.
A source in the campaign for a People's Vote cautiously welcomed the move, saying: "We feel it's moved in the right direction".
To cheers he highlighted that people from across the United Kingdom were present, saying: "They are saying squarely to the leadership of the Labour Party "listen to us, hear us, give us a People's Vote".
"But we will push, if Theresa May fails, we will push for a general election because that's the choice that people should have".
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Edmund then raced to a 7-2 lead in the 10-point tiebreaker that is used in the Laver Cup when the first two sets are split.
- Despite unanimous agreement on the party's ruling National Executive Committee, there are still clear splits between party members and the unions on the question of how MP candidates are selected.
Former Brexit secretary David Davis, who quit in July because he disagreed with Mrs May, is backing the proposal published by the Institute of Economic Affairs (IEA) think-tank, which recommends preparing a "more aggressive" strategy for the European Union negotiations, and opening trade talks with other countries around the world.
According to the Associated Press, the shadow chancellor said that "we argued for "remain" in the past but we lost that vote so we have to respect that".
That has increased the possibility of Britain leaving without a deal, which could hurt the economy and sever trade flows, and spurred those who want another referendum to try to overturn the 2016 vote.
"There is a lot of resentment, a lot of bitterness which I don't think will be very easily dispelled and there may be some Labour MPs who eventually leave on the basis of antisemitism issues", Fielding said.
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Democrats need to win a net total of two additional seats to take the Senate and 23 to assume the majority in the House. The Nov. 6 congressional elections will determine whether Republicans will retain control of Congress.
Speaking to the BBC's Andrew Marr as the party faithful gathered in Liverpool, Corbyn said he would be "bound by the democracy of our party" were members to vote in favour of a second referendum, although he added he would wait and see what wording would be put in front of the delegates after a meeting on Sunday evening.
And with the governing Conservatives in disarray, there are growing calls for Corbyn to take the lead - something he said he was ready to do if May did not get her deal through parliament.
To cheers, he highlighted how people from across the United Kingdom had travelled to make their voices heard, saying: "They are saying squarely to the leadership of the Labour Party "listen to us, hear us, give us a People's Vote".
"The FTA would only apply to the Great Britain-EU relationship, with Northern Ireland effectively remaining in parts of the single market and Customs union", he said.
As activists assembled in Liverpool for their annual gathering, the Labour leader said he would still prefer to force a general election by defeating Theresa May's Brexit plan in the Commons. We will vote down a blind Brexit."Let me be clear: this isn't about frustrating the process".
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