The power of poll

Nowadays polls are very common,everyone talks about them,and guides their opinion after them.The disadvantages are more or less subtle.For example there are made on a sample of a few thousand people which gives a good probability but mostly not exactly.For example,in politics,in the eve of elections,there are shown some contenders,from the main factions/political party,which indirectly promotes them in front of surprising/new contenders,and gives more chances to a bunch of people.Another con' would be that an opinion cannot be expressed in a choice/other and a few choices cannot cover the whole spectrum of opinions and the only option you can take in this case(of course in case you respond to the poll)is to choose others,etc.
      Also it gives a psychological meaning,because people seeing an example get more confidence in the first one/two options of the poll,or at least that's the tendency.For example,when choosing a bank/web hosting site and see a poll about which one is most profitable,and you see that X/Y is the first option in eyes of 30-40%,you might ask why is that?So the message transmitted to the brain is that there must be a reason for that Coke is better than Pepsi or porsche is better than cadillac in the eye of wealthy men.
           Finally,but not lastly,the poll is a way of indirect promoting,and the suspicion is more reasoned if these polls are commanded by some company,or house institutes.
In the campaign of elections,in my country,Romania,the poll is like a compass for the citizens,so it approaches to a manipulation device,the unprofessionalism at its climax.

Poll is related to democracy!But democracy is more powerful,it decides even the destiny of a nation.