Unfortunately it's not that simple. If you allow undue influence of money you loose in effect your freedom of speech and your other freedoms (e.g. privacy, which is not even guaranteed in USA).
You might be interested in the text of the fourth amendment to the U.S. Constitution:
"The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, ..."
...and the 9th:
"The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people."
http://www.archives.gov/exhibits/charters/bill_of_rights_tra...
Only when that influence buys off the government to suppress speech by force. Which is what Clinton is proposing from the get go, not just a possible repercussion.