Question

During the 2012 presidential election, barack obama was endorsed by singer and celebrity beyoncé knowles. to the extent that people pay attention to her and care about what she says, she is a(n):

Answer 1

She is an "opinion leader".
An opinion leader means a person or association who has the power to affect and change the public opinion in a specific field; these people can be from any walk of like, politics, presenters, singers, movie stars etc.