Sanders: I'm going to be president

First, Bernie Sanders said he was going to win New Hampshire.

Then he said he was going to win Iowa.

Now, Sanders is going all the way, telling ABC's This Week in an interview Sunday that "I think we're going to win the Democratic nomination, and I think we're going to win the presidency."

Why? "The American people are sick and tired of seeing the disappearance of the great middle class of this country," Sanders said. "They're sick and tired of working longer hours for low wages while at the same time 99 percent of all new income generated is going to the top 1 percent and the top one-tenth-of-one-percent now owns almost as much wealth as the bottom 90 percent."

Sanders -- a 73-year-old self-described democratic socialist who is a political independent -- remains a long-shot for the Democratic Party's presidential nomination. But he is climbing in polls against front-runner Hillary Clinton in New Hampshire and elsewhere, and he is drawing large crowds across the country.

Things are to the point where opponents are starting to attack Sanders on issues like gun control.

Skeptics are also raising questions about his age, an item that popped up during the ABC interview.

"I'm blessed with endurance, I'm blessed with health," Sanders said. "And we are going to do everything that we can, A, to win this campaign, and, B, as good a president as I possibly can be."