I've seen this sort of poll before, and whilst this does indicate a certain level of racism there are acould of things to note:
1. 26% of Labour voters declined to answer.
2. 28% of Conservative voters declined to answer
3. 20% of Lib-Dems declined to answer.
4. Given the above there's a significant margin of error to the Con and Lab views, and this is probably confounded by the fact that Labour voters may feel group pressure to answer a certain way more so than Conservatives - especially when they know their party is getting hammered over the issue.
5. Whilst the averacious Jew is a nasty trope it's significantly less dangerous than the Rothschild Conspiracy, which is the more common form of Left-Wing antisemitism.
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