BEIJING — In the lofty chambers of the Great Hall of the People, delegate after delegate to China’s legislative body brushed aside questions this week about the constitutional change on the table that could extend Xi Jinping’s presidency.

“I think people are overinterpreting this issue,” Yao Jinbo, the chief executive of 58.com, a Craigslist-like consumer site, said on the opening day of the National People’s Congress, vowing like all others who would speak to journalists that he would support Mr. Xi’s move.

“Please do believe in the party,” he urged, “and the wisdom of the party.”

Not everyone agrees.

For all the orchestration of public support for the proposed changes, dissenting voices continue to surface. For now, at least, they are sporadic and apparently spontaneous, amounting to a faint rumble. They suggest the stirrings of internal discontent — if not yet outright opposition that could build over time.

Maneuvering quickly and with guile, Mr. Xi is moving to secure approval for the change at a planned vote Sunday by the National People’s Congress on abolishing a rule that since 1982 has restricted the country’s presidents to two five-year terms.