The Washington Post editorializes on the prospect of public financing in Maryland."COUNT THIS among sentences we never thought we would write: Maryland Senate President Thomas V. Mike Miller Jr. (D-Calvert) has come out for meaningful campaign finance reform. Mr. Miller, who has thwarted previous efforts to allow public financing for legislative campaigns, is now sponsoring a bill that would do just that. Mr. Miller's change of heart is welcome, even if it comes with some pricey strings attached: Contribution limits will also rise. Still, considering the potential benefits of public financing, that's a worthwhile trade-off."