Republicans have attacked President Barack Obama’s consideration of Anna Wintour as America's next ambassador to Britain, with some claiming that the party’s Senators would move to block her appointment. Obama is believed to have placed Wintour, the editor-in-chief of Vogue magazine, on a shortlist of candidates to replace Louis Susman, who this week confirmed he was stepping down as US envoy to the Court of St. James. Conservative critics described the potential appointment of Wintour, whose only political experience is raising hundreds of thousands of dollars for Obama’s re-election campaign, as “ludicrous” and “a non-starter”. …