Well lets try and get some things cleared up.
1. It is not from Guido, it is from Lord Ashcroft.
2. Lord Ashcroft is a former Deputy Chairman of the Conservative Party.
3. Lord Ashcroft is a Billionaire, estimated wealth circa 1.7 Billion.
4. Lord Ashcroft is a tax exile.
5. The poll (after a quick read) does not mention the number of people asked. Was is 10, 100, 1000 etc thus it is not necessarily at all accurate.
Clearly a 'quick read'. Almost at the bottom it offers "Download the full data tables" Doing this shows that it was a poll of 3189 adults.
6. Thus: it is in all probability a load of bollocks.

If it doesn't match your pre-conceived notions, feel free to ignore it. But don't question its basis without at least attempting to find an answer for yourself.
Does any part of your second and third points invalidate the poll in any way?