Editorial: Our society has a vested interest in maintaining a political system in which candidates are free to adhere to their principles. Yet campaigning for elected office is extremely costly, and because only the wealthiest individuals are able to finance their own political campaigns, most candidates must seek funding from private sources. In so doing, the candidates are almost invariably obliged to compromise their principles. Thus, government itself should assume the cost of candidates' campaigns. Which one of the following principles, if valid, most helps to justify the conclusion as it is drawn in the argument? ['Candidates should not run for elected office if doing so would compel the candidates to compromise their principles.', 'Voters should not support a candidate if that candidate is known to have accepted funding from private sources.', 'Candidates wealthy enough to finance their own political campaigns should not be permitted to raise additional funds from private sources.', 'The government should finance a given activity if doing so will further a vested interest of society.']