JERUSALEM (Reuters) - Israeli Prime Minister Benjamin Netanyahu on Monday overcame opposition within his party to an alliance with a far-right group that opinion polls predict will help him triumph in a January election.
Netanyahu had angered many Likud party faithful with a surprise announcement on Thursday of the merger with Foreign Minister Avigdor Lieberman's ultra-nationalist party.
Some of Likud's 3,700-member ruling body tried to stall the vote by petitioning for a secret ballot, but the alliance won a quick show of hands after Netanyahu pledged in a speech that the move would "not change Likud" or supplant its leadership.
"I've got news for you, I intend to lead Israel for many years to come," he said to loud applause in a packed Tel Aviv auditorium.
Some in Likud had objected to the merger with Lieberman's faction, citing his Yisrael Beitenu party's widely-criticized legislative moves questioning the loyalty of Israeli Arabs and calls to investigate foreign funding of organizations, a move seen as targeting liberals.
Others worried that the deal, which divides up parliament seats between the parties, could rob them of re-election.
But many in Likud seemed swayed by opinion polls suggesting the new alliance would easily triumph in the January 22 national vote. Summing up his own decision to back the union, Vice Prime Minister Silvan Shalom said on Israel Radio ahead of the vote:
"It's true they didn't consult with us as they should, but now that the train has left the station, the risk of cancelling the deal is greater. The prime minister made a decision and it should be accepted."
Three surveys published on Sunday and Monday showed Netanyahu's new bloc winning 35 to 43 seats in the 120-member parliament, well ahead of 20 to 23 for left-of-centre Labor, and a dozen to 15 seats for other centrist parties.
The only challenger seen as possibly threatening Netanyahu's lead was ex-prime minister Ehud Olmert, former leader of the centrist Kadima party, who has not yet said whether he will run since his acquittal on most of the corruption charges that forced his 2008 resignation.
A poll published on Monday in the Maariv newspaper showed Olmert winning just 10 parliament seats to 42 for Netanyahu's Likud-Beitenu bloc. The gap was narrower when Olmert's support was combined with that of other centrists such as former TV news anchor Yair Lapid, running as head of a separate party.
Some pundits see a possible comeback by former foreign minister Tzipi Livni as a potential wild card in the race. Livni quit parliament in March after losing a party leadership race in Kadima to former general Shaul Mofaz.
Livni and other centrists have been holding talks with Labor party leader Shelly Yachimovitch on the possibility of forging a broader ticket against Netanyahu.
But most polls predict right-wing and religious parties more closely allied with Netanyahu will win a solid majority in the election.
Writing by Allyn Fisher-Ilan; editing by Andrew Roche