Ernst has had to twist herself into a pretzel for a few years now. I doubt she thought it would be this difficult as early on the media was hyping her to no end. It's a shame Iowa has become so right wing as she is unlikely to lose reelection.
The knives are clearly out for Warren. She was chased through a Reno airport by Republicans jeering her as Pocahontas. And we're already getting the pushback, as seen above, that she is not as electable as Biden. I think they're right in that she isn't as electable, but I'm really nervous about Biden lasting to the general.