WASHINGTON —Large majorities of young Americans want to see an expansion of government services, including a single-payer health care program, according to a new poll by The Associated Press-NORC Center for Public Affairs Research and MTV.

According to the poll, 69 percent of young Americans between the ages of 15 and 34 favor a national health plan, known as a single-payer program. Eighty-eight percent of young Democrats and 40 percent of young Republicans favor a government-run health insurance program, according to the poll. Roughly two-thirds of young independents are in favor.

Young Americans called health care a very important issue in deciding how to vote. Sixty-two percent of those who will be old enough to vote in the midterms rated it as such. That’s the most who said the same of any issue in the poll, including immigration and the economy.

Majorities of young Americans also favor other types of expansion of government service, including free public college and trade school. Sixty-six percent of young Americans say they support free public college tuition. Seventy-nine percent of young Democrats and 39 percent of young Republicans are in favor. Among independents, 72 percent back free tuition.

Younger people typically do not turn out for midterm elections in great numbers. According to the new poll, more than half say voting in the upcoming midterms is very important, but just 32 percent are certain they will vote.