PORTLAND (AP) — A liberal activist group in Maine is apologizing for sending out a mailer that appeared to make light of a Republican lawmaker’s medical condition.

The mailers from the Maine People’s Alliance, which accused Republicans of having “no spine” for voting against Medicaid expansion, were sent to the district represented by a state Rep. Dale Crafts, who uses a wheelchair.

Mike Tipping, communications director for the alliance that helps elect Democrats, publicly apologized for the mailer.

Tipping tells the Portland Press Herald that he also apologized directly to Crafts, of Lisbon Falls.

Crafts called the alliance a “bunch of liberal windbags.”

Democratic House majority leader Rep. Jeff McCabe of Skowhegan called the offending mailer a “terrible oversight” and said he was “disappointed” by its actions.