She wouldn't be finished. If Iowa voted today, she might get third. It doesn't stop her from enjoying a ridiculous amount of national support across the board.
Right now, certainly. In the future? It's unclear. In every state where the campaign has started revving up (IA, NV, NH and SC), Clinton is not doing as well as she is nationally; the only other states where she's doing so poorly are her major opponents' home states (IL, NC and NM). If she can't keep her voters once the campaign starts, her latent nationwide support is irrelevant.