They didn't mean to say that she was too liberal. What they meant to say is that Kentuckians who could be swayed to vote democrat might be apalled at her attitude and arrogance, that a wealthy scion of a wealthy family who last had residence in Tennessee might be out of touch with the average Kentuckian, and lastly that she might spout what progressives actually believe and cost democratic politicians races in other states.
As far as their worship of FDR goes, none of them, not a single DUmmie anywhere has ever looked at FDR's history before becoming president. He screwed over anyone and everyone, including the little guy. One of the failures of the Coolidge administration was that they either didn't leave him in Haiti without the Marines or that they didn't toss him in jail over it as soon as he got back to America.