How have campaign finance laws had limited effectiveness?

- The ability of groups to find loopholes (soft money) - The First Amendment and the ideological balance of the Supreme Court in striking down key provisions - The lack of legislation on the issue, which occurs both because it is difficult to pass legislation through Congress and perhaps due to unwillingness for politicians to regulate themselves - The difficulty in amending the Constitution to regulate elections, such as Sanders' failed 'Democracy for all' amendment - this would grant Congress the the ability to limit the raising and spending of money in campaigns for public office