According to a new poll, a majority of Americans believe it is no longer practical for the Supreme Court to uphold state bans on gay marriage.

The nation's highest court will hear a case next week challenging bans in four states – Ohio, Michigan, Tennessee and Kentucky – with a ruling expected in June.

According to a USA Today/Suffolk University telephone poll of 1,000 people conducted April 8-13, 51 percent of respondents said that the issue was too far along for the Supreme Court to reverse course. Gay and lesbian couples can currently marry in 36 states, plus the District of Columbia. Conflicting rulings in Alabama have put same-sex weddings temporarily on hold.

Sixty percent of adults under 34 support marriage equality, while fewer than four in 10 of those 65 and older do.

A majority (58%) of respondents also said that businesses should not have the right to discriminate against gay couples based on their religious beliefs.