Why has the use of polling increased greatly in america? what are the dangers, if any?

A simple reason in for the increase of polls is its cheap availability and use of social media, both of these factors when interconnected can make it really easy for anyone with the right approach to create a poll. Those people who are in the policy making business also use the medium to get the latest of public opinions about certain issues which may help them create a relevant policy.

There is just one danger as I see it, that when it comes to politics the politicians focus more on getting votes by spreading and creating biased polls which help mold the public opinion to a certain extent. 

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.

because he is that the right