The Hartford Courant previews today’s argument in federal court in Connecticut on the state’s public financing system.

The mechanism for delivering public tax dollars to political campaigns has dominated the talk about the law. But another of its provisions — one the district judge upheld — also is under attack: A ban on lobbyists and state contractors, as well as their families, from contributing to or advocating on behalf of political candidates.

Uncertainty among candidates about a promise of tens of thousands of dollars has thrown a wrench into the gears of aspiring campaigns. But in a larger sense, there is concern over campaign finance reform as a political reality in Connecticut if the 2nd Circuit upholds Judge Stefan R. Underhill’s September ruling.