I’ll update later after watching Barack Obama’s 30-minute infomercial, which is running on CBS, NBC and Fox. Meanwhile, share your thoughts in the comments.

I have to agree with Chris Bowers that it is ludicrous for some analysts to suggest that a half-hour of scripted prime-time national television, which will not be answered by Republicans, could turn out to be a negative for Obama.

Becky Greenwald is running a 60-second commercial immediately before Obama’s ad on the CBS and NBC affiliates in Des Moines and Mason City. It’s unfortunate that she hasn’t been running tv ads for the last few weeks, but if she has very limited funds to spend on television, this was a smart place to spend them.

UPDATE: I have no idea how many undecided voters were watching (I wouldn’t be surprised if most of the viewers were supporting Obama already), but Obama made his case very effectively. If you’ve donated to Obama’s campaign, I think you should be happy about how wisely he is spending your money.

Greenwald’s ad was outstanding and could not have been more clear about the contrast between her and Tom Latham. Click the link to watch the commercial, which made clear that Latham is a Republican who’s voted with George Bush 94 percent of the time–even more often than John McCain. Meanwhile, the ad showed the word Democrat next to Greenwald’s name as the voice-over stated that she is a Democrat who will support Barack Obama’s policies.

I hope they will be able to air this commercial during the final days of the campaign. Please donate to Greenwald’s campaign if you can afford to, so that more viewers will be exposed to this message.

SECOND UPDATE: A fellow former volunteer for John Edwards observed in a private communication that Edwards-type messaging was all over that Obama tv ad. I agree, but the difference is that Edwards would (in my opinion) never have raised enough money to run a 30-minute ad on nationwide television during prime time (even if he had rejected public financing for the general election).

Here’s the script for Becky Greenwald’s new ad. The visuals mark her as a Democrat and Latham as a Republican even more clearly, but you get the idea from this:

Voice-over: In Washington, whose voted with George Bush 94% of the time?

For more tax loopholes for big oil?

Less regulation on Wall Street?

Even rewarding companies that send Iowa jobs overseas?

Republican Tom Latham, that’s who.  

That’s right.  Tom Latham supports George Bush even more than John

McCain does.

Tom Latham supports George Bush 94% of the time. So Tom Latham won’t support Barack Obama’s changes in Washington.

Tom Latham won’t support Barack Obama. But Democrat Becky Greenwald will.

She’ll help Barack Obama protect our savings by cracking crack down on Wall Street.

Promote Iowa-based energy like wind and bio-fuels to end our dependence on foreign oil.  

And protect Iowa jobs by ending the tax breaks that send them overseas.

Becky Greenwald is on our side and Barack Obama’s.

And Tom Latham?  Well, you get the picture?

GREENWALD: I’m Becky Greenwald and I approve this message.  

It’s time we put Iowa’s families first.