From Rasmussen Reports, “Daily Presidential Tracking Poll” by Scott Rasmussen While dominating the last several news cycles by selecting Joe Biden as his running mate and holding the first night of his convention, Barack Obama still managed to lose four points in the Rasmussen tracking polls. Today, John McCain actually holds a one point lead. These results jibe with my theory that Barack Obama has become overexposed. Having been overexposed, a spell of All-Obama-All-the-Time like we’re in the midst of right now only exacerbates His problems. Obama has become a political version of a past its prime teen band. Lest conservatives get over confident, Thursday will play to Obama’s strengths – the man can deliver a speech. It will be a surprise if Obama doesn’t get at least some benefit from the Invesco spectacular. But if at the end of the week, the Obama campaign remains stuck on hope, change and a visceral dislike for George W. Bush, John McCain will have a great chance to set the tone for the rest of the campaign when he takes over the spotlight on Friday.