Hello,
I was able to select a campaign from my account with the name 'quote"test' by using the following query:
__rdquery=select+CampaignName%2C+CampaignId+from+CAMPAIGN_PERFORMANCE_REPORT+where+CampaignName+%3D+%22quote%5C%22test%22&__fmt=CSV
From looking at the URL unescaped version of the above, it appears that you're missing a backslash in your attempt. Try manually adding a backslash before the quote in your query.
Regards,
Mike, Google Ads API Team

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