Tusk's plan to keep Britain in EU draws mixed response

By William James, Elizabeth Piper and Jan Strupczewski CHIPPENHAM, England/BRUSSELS (Reuters) - European Council President Donald Tusk set out a plan on Tuesday for keeping Britain in the European Union to a mixed reception which underlined the challenges Prime Minister David Cameron faces convincing Britons they should stay in the bloc. Cameron mounted a strong defense of membership of the 28-nation bloc after Tusk released details of his plan following weekend talks, though the British leader