LONDON – Setting up an intriguing election battle, Britain’s opposition Labor Party announced Friday that it had hired President Obama’s chief campaign advisor to help the party return to power next year over the ruling Conservatives. The decision to recruit David Axelrod means that the 2015 British election will pit two of Obama’s strategists against each other. Working for the Conservatives is Jim Messina, who, like Axelrod, toiled on both of Obama’s presidential campaigns and who served as his deputy White House chief of staff during his first term. “David is used to tough fights, and he is going to...