Political pro tip: Don’t mock your opponent’s spouse’s therapy as she battles a cruel, debilitating illness. Got that, DNC?

At issue is a DNC video featuring footage of Ann Romney’s dancing show horse. The DNC used the horse in mocking way to attack Mitt Romney for not releasing his tax returns (and dancing around the issue). The DNC introduced the video as the first in a series of videos featuring Mrs. Romney’s horse. Ann Romney, who trains with the horse as part of her therapy for multiple sclerosis, took offense in an interview with Robin Roberts on Good Morning America, and now the DNC is pulling the video, expressing regret for offending Mrs. Romney. “Our use of the Romneys’ dressage horse was not meant to offend Mrs. Romney in any way, and we regret it if it did,” DNC spokesman Brad Woodhouse tells ABC News.