Is USA a Corporate America?

I listen from individuals that America is connoted as corporate America. That is, who the USA president can be is determined by the will and interests of owners of corporations in advance and, even after election, the president’s existence is determined by them. Is this really the situation?

It is true that corporation owners can play big role for the success of a candidate competing for USA presidential election through their money.  They may buy voters (though cannot buy consciousness), promote the candidate investing huge funds of promotion, etc. But the allegation that corporation owners can use hidden (may be forced pressure) means to choose the president they want seems unrealistic.

Defining America as corporate America may rather be true in context that most of the competing presidential candidates from the Republic favour and address the interests of shareholders of corporations rather than the lower and middle class majorities. Currently, however, President Barak Obama seems to have changed the smell of corporate America to State America. Is that not?