A spokesman for former President Donald Trump threw a social media tantrum — then faced ridicule, taunts and jibes — when a powerful Democrat threw support behind Vice President Kamala Harris. Trump’s co-campaign manager Chris LaCivita expressed late Sunday night his outrage that U.S. Secretary of Transportation Pete Buttigieg endorsed Harris to run for president. “Great !!” wrote LaCivita on X, just minutes after Buttigieg’s endorsement went live. “Keep doing what you are doing …MORON.” Want more breaking political news? Click for the latest headlines at Raw Story. LaCivita’s unsubtle respons…