The ENQUIRER's exclusive bombshell expose as Sen. John McCain's wife, Cindy, is caught with another man!

Not only that but multiple witnesses have caught the pair lip locking on several other occasions.

"I couldn't believe I was watching Cindy McCain passionately kissing and hugging another man!"

That's the stunned reaction of an eyewitness who says he watched in shock - and snapped photos - as the former presidential candidate's wife...