Of all the interests backing President Barack Obama's call for Congress to authorize military strikes on Syria, perhaps none is more concerned about the prospect of a "no" vote than America's pro-Israel lobby, which is finding it difficult to overcome widespread opposition to the use of force.
Considered to be some of the most influential lobbyists on Capitol Hill, officials with several pro-Israel groups say they are running into rare resistance from lawmakers, even among staunch Israel advocates on whose support they could almost unquestionably count in the past.
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The administration has sought and won support for the vote from most of the major pro-Israel groups that traditionally have been most effective in promoting legislation to enhance Israel's security.
Among those that have released public statements and made private calls to lawmakers to urge them to vote "yes" are The American-Israeli Public Affairs Committee, or AIPAC, the Anti-Defamation League and the Simon Wiesenthal Center.
"There is no question that it is very challenging," said an official from one, who spoke on condition of anonymity because he is not authorized to speak publicly on behalf of the organization. "It is an extremely challenging environment right now."
The crux of their argument is that inaction will undermine American credibility in limiting the development and use of weapons of mass destruction with a direct impact on Israel's security, particularly as it relates to Iran and its nuclear program.
Israel regards Iran as an existential threat, and preventing Tehran from developing nuclear weapons is its primary national security concern. Iran says its program is for peaceful purposes.
Lobbyists also acknowledge that a US military strike could risk Israel becoming a retaliatory target of Syrian-backed Hezbollah or other groups acting on Assad's behalf. But they say that risk is smaller than the risk of letting Assad go unpunished.
"This critical decision comes at a time when Iran is racing toward obtaining nuclear capability," AIPAC said in its statement. "Failure to approve this resolution would weaken our country's credibility to prevent the use and proliferation of unconventional weapons and thereby greatly endanger our country's security and interests and those of our regional allies."
"AIPAC maintains that it is imperative to adopt the resolution to authorize the use of force and take a firm stand that the world's most dangerous regimes cannot obtain and use the most dangerous weapons," it said.
The Anti-Defamation League urged Congress to "act swiftly to add its voice to hold (Assad) accountable for the wanton slaughter of his own citizens."
"Any nation that violates international norms and obligations which threaten the peace and security of the world must face the consequences of those dangerous acts," it said.
Invoking Holocaust
In making their case for military action to punish Syria for using chemical weapons, Obama and his aides have gone out of their way to court the support of the American Jews by drawing parallels between Syrian President Bashar Assad's use of poison gas and the gas chambers of Nazi Germany.
Visiting the Great Synagogue of Stockholm on a trip to Sweden last week, Obama alluded to the connection while paying tribute to Raoul Wallenberg, the Swedish diplomat credited with saving at least 20,000 Jews during the Holocaust.
"Because he refused to stand by, Wallenberg reminds us of our power when we choose not simply to bear witness, but also to act," Obama said.
He later added: "I cannot think of a better tribute to Raoul Wallenberg than for each of us, as individuals and as nations, to reaffirm our determination to live the values that defined his life and to make the same choice in our time."
Secretary of State John Kerry has invoked the phrase "never again," a direct reference to international vows to prevent a repeat of the Holocaust, and even compared Assad to Adolf Hitler, something that even the pro-Israel groups backing the administration have shied away from, at least so far.
Despite winning universal condemnation of Assad for using chemical weapons, the administration has found its arguments are not convincing skeptical lawmakers and their war-weary constituents that military action is a moral imperative.
"I think Israel has a strong natural defense and I think they can do well in any battle. But I don't want to involve Israel in a battle because they have so many enemies around them that I'm fearful it can spin out of control," Sen. Rand Paul, R-Ky., told Sean Hannity of Fox News last week.
Officials with several pro-Israel groups say they are encountering the same problem, which is compounded by pure political motivations, especially among Republicans, for opposing Obama's request.
They said they will continue to lobby in the days ahead - AIPAC is bringing some 250 pro-Israel activists to Washington next week to push for the authorization - but they have also told the White House that only a powerful and direct personal appeal from Obama himself is likely to have an impact.
"The idea that the pro-Israel community is a magic wand that can make this vote happen is a conspiracy theory," said Josh Block, a former AIPAC spokesman who now heads The Israel Project. "It's not born out of reality."
"But, certainly when supporters of the US-Israel relationship and experts in the region who have real credibility join with the president and other voices in the foreign policy and human rights community, it matters," he said.
Of course, Republicans are not the only ones opposing the authorization.
Democrats conflicted
Many of the president's Democratic supporters are deeply conflicted over the use of force.
"I think every member of Congress' perception is colored by what happened in Iraq," said Rep. Bruce Braley, D-Iowa, who is seeking a Senate seat in 2014 and is leaning against authorizing force. "If Iran responds to our sending cruise missiles into Syria by launching an attack into Israel, and then Israel retaliates, and Hezbollah retaliates against Israel, I have a hard time seeing how the United States avoids getting drawn into a broader regional conflict."
This divide also is apparent among Israel-centric organizations.
J Street, the relatively recent arrival to the Israel-related lobbying scene that has promoted peace with the Palestinians as its major issue, condemned the use of chemical weapons but stopped far short of the other groups in offering explicit support for Obama's call.
"As President Obama and world leaders contemplate the appropriate course of action, we are cognizant that there are no easy or clear-cut solutions," it said. "Any action taken should aim to minimize the loss of civilian life, deter the further use of chemical weapons and avoid regional spillover."
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