According to Real Clear Politics:
Obama 17,535,458 - 48.1%
Clinton 17,493,836 - 48.0%
Obama wins by 41,622 votes
The only way Senator Clinton wins the popular vote is if you count Michigan, but give zero votes to Senator Obama. That'd be Clinton +286,687. However, if you count Michigan and give Senator Obama the uncommitted votes -- as well as the caucus state totals -- Senator Obama wins by 61,703 votes.
Close, but ultimately irrelevant. I'm going with the RCP total above.