Representative Charles Boustany, as reported by Chad at The Dead Pelican, has called for an investigation into ACORN.
Boustany is the ranking Member of the Oversight Subcommittee for the House Ways and Means Committee and has jurisdiction over tax policy and the IRS. ACORN, as you know, was taped giving tax advice to individuals posing as a prostitute and pimp. The ACORN workers on the video were fired as were others in a separate video.
The Dead Pelican has the text of Boustany's letter to Chairman Lews of the Oversight Committee here.