According to the New York Times,
A national syndicate will offer replacement “Doonesbury” comic strips to newspapers that don’t want to run a series that uses graphic imagery to lampoon a Texas law requiring women to have an ultrasound before an abortion, executives said Friday. A handful of newspapers say they would not run this week’s series, while several others said the strips would move from the comics to opinion pages or Web sites only.
Surprise surprise! The Providence Journal, owned by the Texan Belo Corporation, is one of those papers pulling the series. The Daily Cartoonist has a complete list of the papers not running the strips as well as the papers who are running the series in their editorial section, which seems okay. (Slate seems to be hosting the strip.)