Americans understand these things intellectually but time after time vote for candidate based on magical powers candidates are presumed to have. Childlike notions about what government is capable of doing get us all in trouble time and time again.
Just as damaging is the childlike notion that candidates run for office out of out of anything other than self interest. While you might naively expect a candidate to serve you, you are more likely to serve the candidate. The candidates will represent whoever makes it worth their while. Your role as a voter is simply to put them in office with as little obligation to you as possible on the part of the politician.
Remember that only sociopaths win elections and that truth has no utility in politics.