NEW DELHI — Two months before Indians vote in national elections, a new poll suggests that India’s dominant political party and family may suffer one of their worst defeats in the country’s 67-year history.

Seventy percent of Indians say they are dissatisfied with the way things are going in India today, according to a new Pew Research Center survey. And 63 percent of those polled said they would prefer that the opposition Bharatiya Janata Party lead the next government, compared with just 19 percent who picked the governing Indian National Congress party, which is led by Sonia Gandhi and her son, Rahul Gandhi.

“This poll affirms what most of us suspected,” said Shekhar Gupta, editor in chief of The Indian Express, a daily newspaper published in Mumbai. “But what it doesn’t tell us is who will lead the next government.”

The pollsters interviewed 2,464 randomly selected adults between Dec. 7 and Jan. 12 in states and territories that are home to roughly 91 percent of the Indian population. The poll has a margin of sampling error of four percentage points.