Get ready for the race to the Democratic nomination to get ugly. Democratic strategists say polls and fundraising show Hillary Clinton is all but unstoppable — unless the gloves come off. The Associated Press reports:

“If Hillary wins Iowa, she can practically start shopping for a running mate,” said California-based Democratic strategist Dan Newman.

But that’s a big if. Clinton has called Iowa her “hardest state,” and it’s the best-some say only-chance her opponents have to get past her.

“At this point the trailing candidates need to not only catch a huge wave, they also need one to crash on top of Hillary,” Newman said. “They need to upend the conventional wisdom that is gelling among donors and others that she can’t be stopped, and they need to prove it in Iowa.”