Geez … Talk about someone who has not learned a painful lesson.

Sen. John McCain is talking with Democrats about a joint effort to require outside groups that have spent millions of dollars on this year’s elections to disclose their donors.

McCain (R-Ariz.), once Congress’s leading champion of campaign finance reform, has kept a low profile on the issue in recent years.

He raised the ire of many Republicans a decade ago for pushing comprehensive reform, and many Republicans still held it against him during his 2008 presidential campaign.