If you poll a non-developed country, you won't get accurate results. Ever.
^^
this is very true. Furthermore, I would guess that polls in non-developed countries with a further history of authoritarian rule are even worse
In Arab countries it's actually very hard to count the population, much more "do polling" (the last census in Lebanon, for example, country considered much more developed than Egypt, was before WWII).
Stop thinking for a moment in European/American terms, when you're talking about very diffrent part of the world, for heaven's sake!