Netanyahu came to the United States and rebuked President Obama and US foreign policy and intelligence before a national audience (even though he tossed in some pro forma claims of respect for Obama), in order to sabotage foreign policy and ensure his own reelection. These are two goals upon which there can be no doubt.
It should also be noted that Netanyahu made a deal with the devil, because his appearance before Congress enabled the Republican Party to once again evoke the image of the president often promoted by the GOP and Fox: the image of a black president who doesn’t know what he’s doing, and is a threat to the security of the US. Netanyahu received ovation after ovation in his speech before Congress, even though, as Newsweek noted, his credibility on Iran was recently seriously challenged by a leaked Mossad document.