Scotttish Lib Dem leader Willie Rennie has apologised for an online cartoon portraying Alex Salmond in Arabic dress.
The image was supposed to be a joke after Salmond compared Qatar and Scotland, but Rennie said he had "withdrawn" it, adding that it was published on his day off: "I apologise for the offence that has clearly been caused by our cartoon on the first minister's remarks in Qatar.
"Although I did not approve its publication I accept responsibility for it", he told BBC Scotland's Good Morning Scotland.
But it's not the first - and won't be the last - political ad to cause offence. Take a look at our pick of bad political adverts below, from the offensive to the downright weird:
During the 2010 election, Labour MP Roger Godsiff distributed leaflets with pictures of paedophile Vanessa George and murderer Steven Wright asking "Do you want convicted murderers, rapists and paedophiles to be given the vote? The Lib Dems do?" Labour disowned the ads and he withdrew the leaflet.
Not only is Herman Cain's add weird - it has also been panned for glorifying smoking.
Not only is Christine O'Donnell not a witch - she was also defeated in her fight for a seat in Delaware.
During the AV referendum campaign, one advert alluding to the cost of a new voting system pictured a baby, reading: "she needs a new cardiac facility, not an alternative voting system". The add was reported to the ASA by blogger Sunny Hundal - but No to AV still won their campaign.
This UKIP leaflet from the 2010 election campaign delivered in Lancaster and Fleetwood reads: "He used to ignore immigration ... now he lives on a reservation"