On Friday, I noted that a number of campaign finance experts, including Yale’s Bruce Ackerman and Ian Ayres and Harvard’s Larry Lessig, support a voucher system in which every eligible voter has a $50 voucher or tax credit to donate to a campaign of his or her choice. In exchange, campaigns either agree to maintaining donor anonymity to avoid influence peddling (in Ackerman and Ayres’s system) or to only accepting donations of $100 or less (in Lessig’s).