The Democratic Party has a monstrous credibility issue with its own voters now, given President Joe Biden’s devastating performance Thursday night during the first 2024 presidential debate. Seeing was not only believing — it was unifying and telling. And what it told Biden voters and potential Biden voters was that Biden’s day is over. The mask of lies he’s been hiding behind, the one Republican voters have been talking about all along, finally fell off. The shell that remained smelled of a shadow government and deceit. This time, Democratic voters got their whiff. Panicked for lack of immedi…