On Wednesday during the Arizona Republican debate, Charles Blow's Twitter feed said:
"Let me just tell you this Mitt "Muddle Mouth": I'm a single parent and my kids are *amazing*! Stick that in your magic underwear."
Faithful members of the Church of Jesus Christ of Latter-day Saints who receive temple ordinances wear an undergarment as a reminder of covenants they have made.
On Friday, Blow issued the following apology via the same Twitter feed:
"Btw, the comment I made about Mormonism during Wed.'s debate was inappropriate, and I regret it. I'm willing to admit that with no caveats."
Blow has been a columnist for the New York Times since 2008, and has often been critical of conservatives.
A Buzzfeed.com article described Mormon garments as "...a rough equivalent of Jews' yarmulkes or tzitzit."
Buzzfeed's article also noted:
"It's difficult to imagine a Times writer making a similar joke about a Jewish politician."
Romney used a little sarcasm to brush off the tweet during a radio show on Thursday, saying, "I guess we're finding out for the first time that the media is somewhat biased."