CAMPAIGN FINANCE, VOTING RIGHTS, AND TERM LIMITS REFORMS
Pure libertarianism might suggest that a person can use his own money and resources to seek and hold public office as much as he likes. In practice, the attempt to get re-elected time after time tends to make politics more partisan and more open to "pork barrel" and more open to the barter of special interests. Furthermore, some "professional politicians" seem to have lost touch with the real world of economic competition and incentives (and family motives). Hence, many libertarians support both term limits and campaign finance reform.
For libertarians, ballot access would be the most wanted voting reform. But other progressive voting schemes, such as proportional representation (requiring larger districts) and instant runoff, tend to give challenging candidates a much better shot and tend to make voters aware of issues outside of their most immediate communities.