A little while ago, I did a column about Bill Clinton's latest comeback, this time as a popular endorser of embattled Democratic candidates across the country. Just before I wrote the column, in July, Clinton's favorable rating had eclipsed Obama's for the first time, according to Gallup. That trend has continued. According to the latest Gallup numbers, Clinton's impact on Democratic voters is stronger than Obama's, which means his endorsement is more valuable. What's also interesting, but not surprising in light of Obama's growing unpopularity, is that Clinton's endorsement has much more of an influence on independents and Republicans, as well. It'll be interesting to see how Clinton is deployed over the next few weeks.