And since Chaim is a Tzaddik, the curse has been placed on Anthony Weiner. It is possible for one Tzaddik to lift the curse of another, but repentance usually has to come with it. My rabbi talk a story of someone who was given a curse that he would loose his feet if he didn't help someone save a horses life. Many years later a doctors diagnosis showed this would have to be the case, but the guy who was not a Chassid went to the Rebbe who lifted the curse under the scenario that the guy read Tehilen every day. The curse was only partially lifted because he had to read from it every day to prevent the curse from coming back. Of course reading from Tehilen was a blessing.
When another Tzaddik undos a curse from Chaim, it is not an insult against Chaim, rather Chaim is a part in bringing the sinner back to Hashem.