I don't think the Democrats would take the brunt of the flak. After all, the GOP did oversee what led to the Depression and I do think that Smith, while unwilling to go New Deal, would do some intervention and more than anything Hoover did in the OTL. But I do think that Smith's not being able to get the nation out of the Depression would draw some flak and Hoover, given time to think, could become interventionist unlike in the OTL (after all, he began to be interventionist near the end of his term in the OTL; with time to see the Depression unfold, he could get the opinion of intervention in he ran agaisnt Smith in 1932). So the blame could be a bit more evenly spread. However, I'm not sure Hoover can beat out Smith. I'm not sure Hoover would actually be more interventionist than Smith, if he decided to be interventionist, and Smith still wouldn't bear the brunt of the blame; it'd just be that things out of his control happened. Then again, it could end up a Carter thing with Smith where he didn't cause the problems, but got the blame for it