Almost one year after Donald Trump last posted to X (formerly Twitter), the social media platform’s billionaire owner, Elon Musk, reactivated the former president’s account Monday, allowing him to post as Vice President Kamala Harris surpasses her 2024 opponent in several polls. Trump’s post came ahead of a sit-down interview with Musk — a loyal MAGA supporter — slated to take place Monday night. In addition to posting a two-and-a-half minute campaign video, the ex-president also wrote: Are you better off now than you were when I was president? Our economy is shattered. Our border has been era…