Gopnik's allegations have been dismissed by Dr William Oddie, whose book Chesterton and the Romance of Orthodoxy will be published in November. While admitting that Chesterton's views on Jews were "eccentric" he holds that they were no different from those of Zionists, who maintained that Jews were exiles and would never be happy until they had their own country. (Chesterton died in 1936 before the state of Israel was created in 1948.) Dr Oddie states that "Gopnik is quoting grotesquely out of context" and that on several occasions in the late 19th century, Chesterton had passionately attacked anti-Semitism and that he particularly disliked the persecution of Jews.
Also, Nancy Brown posted Dale Ahlquist's response to the New Yorker at the ACS blog along with some more details on Chesterton's beliefs about the Jews.