Commentary: A perfectly-timed communication can be a game-changer. This may be one of those times. Take a look at the new Ron Paul ad attacking Newt Gingrich, if you haven’t already seen it as it virally screams across the interwebz this afternoon:

This ad is a brilliant attack, not over-done, credible, and may be perfectly timed to coincide with the probability that Gingrich, the Republican poll leader-of-the-week, may be wearing thin on Republican primary voters as his record is closely scrutinized, as the record of anybody in the lead would be.

But it’s the fact that it’s a Ron Paul ad that makes it most interesting. Clearly Paul wants to be the next in batting order for leader-of-the-week, and this ad may not only shorten Gingrich’s week, but also signal to voters that Paul is ready to be a grown-up and play with the big dogs.

It will be interesting to see how the tracking polls change trajectory for each man in the next few days. Stay tuned — we may be nearing the end of Gingrich’s 15 minutes of fame, if favor of yet another Republican hopeful’s play to be the Republican alternative to Mitt Romney.

You can find more of Harold Cook’s writing on his blog, Letters from Texas.