Scott Brown heads to bar after swearing in

Scott Brown’s first stop after being sworn into the Senate Thursday afternoon -- the Dubliner.

An ITK spy spotted the Republican senator from Massachusetts sitting near the window of the popular Capitol Hill watering hole at 6:45 p.m., less than an hour after Vice President Joe Biden finished administering the oath of office.

Brown was drinking Guinness and being serenaded by Irish tenor John McDermott, according to our spy.

It may be a long night for the new senator: Brown's supporters were planning a celebration at the Union Pub later on.

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