In the Know with Judy Kurtz: Biden & Gaga, Trump Twitter war

- Vice President Joe Biden and pop star Lady Gaga - fresh off their Oscar appearance - are teaming up for an encore performance.

Plus, a Twitter war over Donald Trump between two Hollywood stars!

"The Hill's" "In The Know" columnist, Judy Kurtz, has the latest.

Get more online: http://thehill.com/blogs/in-the-know

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