The 2016 presidential campaign rumbled through Indiana Sunday focused on Tuesday's critical primary, even as front-runners Hillary Clinton and Donald Trump itched to fully engage in the one-on-one battle they cast as inevitable.

But the underdogs in both parties made clear they had no plans to exit the race, at least until the Indiana results come in — and perhaps longer.

"We're going the distance," Trump rival Ted Cruz said on ABC's "This Week," arguing that Trump won't be able to get the majority of delegates required to clinch the nomination. "We're going into Cleveland, and it will be a contested convention."

On the Democratic side, Bernie Sanders insisted that his path to the nomination depends on the unlikely prospect of flipping superdelegates who are now committed to Clinton. Superdelegates can vote for the candidate they prefer. The former secretary of state is still 91 percent of the way to the nomination, according to The Associated Press. She is 218 delegates away from winning the 2,383 need to clinch the nomination.... Read More: ABC News