A strong allegiance is in US and democratic world’s interests so pushing the UK to EU makes sense. Also, see Democracy Chronicles’ Adrian Tawfik’s article The American Role in Encouraging European Unification that is a broader expansion of this idea.

Could Obama help Cameron’s case for sticking with EU?

The Christian Science Monitor

British Prime Minister David Cameron speaks during a joint news conference with President Barack Obama, Monday in the White House in Washington. Mr. Obama expressed support for Mr. Cameron’s plan to try to reform the European Union before putting a referendum on EU membership. | Democracy, elections, and voting at Democracy Chronicles