Well, for a change, I got a coin-flip this week that threw me for a loop. I am supposed to argue that we should maintain the public campaign finance system for federal elections (and, perhaps, mandate its use). But, by golly, after my research, I decided that it doesn't make a lick of difference where the candidates get their "individual contributions."

Fundamentally, proponents of public campaign financing say that this system reduces the possibility of corruption (because the source of candidate funding is known in advance, and is above-board), and helps to minimize the relative advantage of having deeper coffers than other candidates, such that "buying an election" becomes less likely. Under this system, candidates are not permitted to use more than $50,000 of their own money for their campaigns (unlike the substantial personal financial input provided by previous candidates, Steve Forbes, Ross Perot, Mitt Romney, and Hillary Clinton, to name a few). Of concern to candidates of parties other than Democratic or Republican, public financing is not available to them.
Those who support private campaign financing suggest that it, alone, protects the constitutional right of (unlimited) free speech, and that this system is regulated sufficiently to guard against corruption. The system is said to be superior because each donor has the right to direct their support to a specific candidate (where no such ability exists with public finance funds), further protecting the rights of donors to not support a candidate they don't like. Moreover, there are no limits on how much can be amassed in the aggregate, so if a candidate enjoys support from a much larger proportion of the public than his/her opponents, then his advantage in advertising funds is proportionate and fair. Finally, any party's candidates can get this form of funding -- not just Democrats and Republicans.
So, why doesn't it matter which system we use?
Of minor relevance, there are some equalizing factors between the two systems. First, the advantages of private financing are mitigated by available funds through public financing: 1) public financing subsidizes the nomination conventions of those candidates that accept it (not an insubstantial cost), and 2) public financing pays for the costs of attorneys and other administrative costs (also nothing to sneeze at). But that's not the main issue.
A less obvious issue is that, while we all know that public financing, at least in the 2008 campaign, garnered Senator McCain only about half the money that was collected by President-elect
If, however, candidates were required to use public financing (or, more accurately, prohibited from using private financing), the percentage of citizens choosing to donate with their tax returns would likely rise precipitously. So, while the free choice to accept private financing exists along with the public financing system, a candidate can choose either method and take his chances, but private financing seems to hold the advantage so long as it remains available. This, by itself, is no reason to mandate one or the other.
The overarching reason the system chosen doesn't matter is that they each deal with "hard money" contributions only. Both systems allow expenditures of "soft money" contributions through the activities of political action committees (PACs), and by organizations known as "527s" and "501(c)s." Taken together, these organizations spend unlimited donation monies to support issues (directly), and candidates (indirectly ). The only "free speech" limitation on these groups is that they cannot suggest voting for or against a particular candidate. They can (and do), however, say things like, "candidate A is the only patriotic contender," and "candidate B is clearly unpatriotic." The power of these groups to affect elections was well illustrated by the soft-money-fund
Some might argue that direct candidate ads have a great deal of impact on voters' choices. That may be true, but I submit that the number of ads, and the geographic spread of them, is not as important to campaigns as it once was because of the advent of 24 hour news networks that endlessly replay the campaign ads of the candidates during the entire course of the election cycle. Even though John McCain spent far less than Barack Obama, for instance, I saw every important political ad that McCain produced as many times as I saw Obama's ads (okay...maybe not quite as many times, but effectively so). The news pundits see these ads as free content, and this essentially gives every candidate free air time. Unfortunately, the news outlets also give free replay time to the ads from the PACs, 527s and 501(c)s. So, again, the power of soft money organizations remains superior. Until this changes (through FCC regulations on media or a Constitutional amendment limiting soft money free speech), there is simply no important difference between the public and private campaign finance systems.
Campaign finance is a very complicated issue, to be sure. But concerning ourselves with an either/or argument over public or private donations is, quite simply, a misdirected effort. Both systems are regulated to prevent corruption, with debatable success, perhaps. But campaign finance reform needs to concern itself primarily with soft money controls if we expect to level the playing field for all candidates and prevent corruption and influence peddling in presidential campaigns.