Six Democrats joined all House Republicans to hold former Internal Revenue Service official Lois Lerner in contempt of Congress on Wednesday.
Most of the six Democrats face tough reelection battles this year: Reps. Ron Barber (Ariz.), John Barrow (Ga.), Collin Peterson (Minn.), Mike McIntyre (N.C.), Nick Rahall (W.Va.) and Patrick Murphy (Fla.).
Rahall is facing one of the toughest reelection races of his career, as is Barber.
The National Republican Congressional Committee quickly pounced on the other Democrats who opposed the contempt resolution.
"House Democrats aren’t just stonewalling the investigation into Benghazi, they also continue to hinder the investigation into the IRS," the NRCC said in a release.
Barrow, McIntyre, Peterson and Rahall also voted to hold Attorney General Eric Holder in contempt in 2012 for not complying with a congressional subpoena.
Seventeen Democrats joined all Republicans to support that contempt resolution.