US President Barack Obama has made a surprise call to a radio show featuring outgoing Virginia Governor Tim Kaine. Disguised initially as "Barry from DC", Mr Obama quickly revealed who he was, congratulating the governor for his "terrific" service to the US state. "We are just really proud of you," Mr Obama told the Democratic governor. Mr Kaine blushed as he said that the presidential call "means a lot" for him during his last appearance on WTOP's weekly show "Ask the Governor". "We continue to think that your wife is probably a little superior to you," Mr Obama said jokingly during Tuesday's radio show. He added that both he and the governor were married to "better people" and "we've got to stick together". In response, Mr Kaine said: "We're lucky and the nation is lucky... it's been an amazing first year of your administration, and I'm so excited." Mr Kaine is stepping down in January after serving one full term, in accordance with Virginia state laws. He is also a current chairman of the Democratic National Committee - the body that governs the party on a day-to-day basis. Source: BBC