Politico's Jonathan Martin looks at why third-party groups haven't been as active on behalf of the Republican candidate as in 2004. Among other things, this means that we may not see much of Jeremiah Wright in the final weeks of the campaign:

"Many in the party, including inside the McCain campaign, have held out hope that a deep-pocketed benefactor would emerge to bankroll ads in the campaign’s final days – spots that might, for example, resurrect the most incendiary clips from the Rev. Jeremiah Wright.

But thanks largely to lack of passion for McCain within the conservative base, diminished hopes that he can win and a sharp decline in the stock market that has badly pinched donors’ pockets, veteran Republican operatives say it appears almost certain that what could be the most damaging line of attack against the Democratic nominee will be left on the shelf."

UPDATE: Here is a new ad from the group Let Freedom Ring. This minute-long spot attacks Obama on the issue widely seen as his strongpoint, his handling of the economy:

Let Freedom Ring ad: "Part of the Problem:"