President Obama's camp is making out that Mr Romney is "writing off" half the country, while he argues the comments related to election strategy and were intended for a select audience.
More top news
Curran had worked on the popular animated series for 17 years and wrote a number of episodes.
Tory MPs are taking lumps out of each other on Heathrow, grammar schools and - above all - the true meaning of Brexit.
The lottery winning rapist claimed the police were jealous of his lifestyle after he was convicted of resisting arrest