The leader of Britain's opposition Labour Party, Ed Miliband, speaks to supporters earlier this month in London. His party and the ruling Conservative Party have both hired former advisers to President Obama in advance of Britain's national election next year. Peter Macdiarmid/Getty Images hide caption

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Jim Messina (left), the head of Organizing for Action and a former top Obama campaign and White House aide, watches President Obama make a statement in the White House Cabinet Room in 2010. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

Jim Messina, President Obama's 2012 campaign manager Charles Rex Arbogast/AP hide caption

itoggle caption Charles Rex Arbogast/AP