Ariel Sharon visited the US in February of 2002 in order to explicitly tell the Bush administration that the main threat was Iran, not Iraq.
http://www.washingtonpost.com/ac2/wp-dyn/A35510-2002Feb6?language=printer
"During meetings here yesterday, including with Vice President Cheney, Israeli Defense Minister Binyamin Ben-Eliezer warned of the hazards posed by Iranian support for terrorist groups and development of advanced weapons.
"Today, everybody is busy with Iraq," Ben-Eliezer said in an interview. "Iraq is a problem. . . . But you should understand, if you ask me, today Iran is more dangerous than Iraq.""
Here's an October 2002 article in which Israels' chief of staff says he's not losing any sleep over the Iraqi threat.
http://www.nytimes.com/2002/10/07/international/middleeast/07ISRA.html
Here's the head of the Israeli army, right before the war in 2003, saying that he was more concerned about Palestinian militants and Iran rather than anything Iraq was doing, and that war in Iraq would cause a "regional earthquake".
http://news.bbc.co.uk/2/hi/middle_east/2736283.stm
Here is former Israeli defense Minister Moshe Arens in 2002 proclaiming that the primary missile threat in the region was Syria, not Iraq.
http://www.jcpa.org/brief/brief2-4.htm
Arens says:
"The present Iraqi capability is relatively limited. According to recent U.S. estimates, Iraq may have a dozen or two Scud missiles that were not caught by UN inspectors. They are working to attain nuclear capability but do not have it at the moment. However, both the Iraqis and the Iranians have chemical warheads, and both probably have biological weapons as well."
This is hardly the assessment of people beating the drums for war in Iraq.
Here's an October 2002 article which describes how opinion on the Iraq war is divided in Israel.
http://articles.latimes.com/2002/oct/16/world/fg-iziraq16
Interesting comments include the assessment, which is also present in the BBC article, that if the war fails the people who will pay the price are the Israelis. Also many doubt the threat capability of Iraq, and many resented the prospect that the US would handcuff Israel with the Palestinian issue during the Iraq war.
Finally, Netanyahu didn't advocate war in Iraq in his speech to Congress. He did so in an op-ed to the WSJ, but that's not what you're claiming. Why do you have to make stuff up? At any rate, Netanyahu wasn't relevant at the time.
Here's the speech you're referring to.
http://www.freerepublic.com/focus/f-news/531335/posts
Iraq is just one of many threats Netanyahu mentions in the speech. In fact Iraq is the third specific case he mentions in his description of the "international terror network". The first case he mentions is Iran. In the speech Netanyahu says the following:
"The growth of this terror network is the result of several developments in
the last two decades: Chief among them is the Khomeini revolution and the
establishment of a clerical Islamic state in Iran. This created a sovereign
spiritual base for fomenting a strident Islamic militancy worldwide, a
militancy that was often backed by terror."
Walt and Mearsheimer select out any evidence, public statements, or polls which do not conform to their narrative of the pro-Israel lobby and Israel controlling US foreign policy in the Middle East.