(CNN) – A few weeks ago, 21-year-old Wisconsin superdelegate Jason Rae was taken out to breakfast by Chelsea Clinton in the runup to that state’s Democratic primary. Two days after the vote, the college junior – who will be the youngest superdelegate at this year’s Democratic National Convention — is undecided no longer: he’s backing Barack Obama.“The Democratic Party is fortunate to have two very talented individuals running for President this election,” said Rae in a statement released by the Obama campaign Thursday. “It is a difficult choice for anyone, but in the end, the choice for me has become...