[Non-Sequitur]

He has produced evidence that the presented documentation is a forgery. Don’t believe it? Take that up with Polarik, the expert on this stuff. So why would Obama present forged evidence?

But what evidence has Berg provided showing Obama wasn't born in the U.S.?

[Kevmo]

But what evidence has Berg provided showing Obama wasn’t born in the U.S.?
***I gather you have a reading comprehension problem, because starting with the 2nd sentence, your question is already addressed:

Don’t believe it? Take that up with Polarik, the expert on this stuff. So why would Obama present forged evidence?