"McCain compared Obama to Herbert Hoover, the Republican who was president when the stock market crashed in 1929 triggering the Depression."

The author's intended audience was for Obama supporters, which of course I am:). If you go to http://delong.typepad.com 

you'll find the article I'm commenting on. Their claim is that McCain is so busy trash talking Obama he comes out looking like an idiot when he himself does bad decisions. He compares Obama with Herbert Hoover but who does he think he is FDR?

I am not sure that anything McCain says is going to have a great impact. Those supporting Obama have already drunk the kool-aid and are unreachable. The undecided are the only ones that McCain has a chance to reach, and most of them are so fixated on the economy and wanting to blame somebody that they already are predisposed to blame the party in power.
Frankly, I am of the opinion that, outside divine intervention from God, Obama is the next President, and America will dissolve into a socialist state, much like France, Italy, Spain, Sweden, and Canada. 
America is so angry right now that they cannot or will not see the truth. America's woes started long ago, even before Bill Clinton. But the current economic crisis started under Clinton with their pressuring the financial industry to make these bad loans that have now crashed and burned and have us in the fix we're in. We can also thank Nancy Pelosi, Barney Franks, Chris Dodd, and the other Democrats that stuck their head in the sand and did not listen when Bush and McCain tried to convince congress more oversight was needed and a tightning of the lending policies.
Unfortunately, those truths will go unheard or ignored, and we are going to have a President that will dessimate our military, insure at least five million more babies will be cruely aborted, and will tax and spend the nation right into oblivion. Way to go, America. God help us.