The lead investigator in Sheriff Joe Arpaio’s probe of Barack Obama’s eligibility for Arizona’s November presidential ballot is convinced he has “indisputable proof” the document presented by the White House as Obama’s birth certificate is fraudulent.

But after presenting his latest evidence at a press conference in Phoenix Tuesday, the gathered media wanted to talk about him, not the evidence.

“Obviously, the information we are bringing forth is becoming very difficult for them to refute,” Mike Zullo told WND in an interview after the event.

Missed the news conference? Watch an exclusive video of Sheriff Joe Arpaio’s latest on the Obama eligibility probe

“What the media was trying to do was the Saul Alinsky tactic of discrediting the person that is bringing forth the information,” he said, referring to the 1960s Marxist activist whose book “Rules for Radicals” is a manual for left-wing activists.