Most U.S. voters say likely Democratic presidential nominee Hillary Clinton and presumptive GOP nominee Donald Trump either won’t try to follow through on some of their major campaign themes or will try and fail, according to polling released Thursday.

Most voters — 56 percent — said Mrs. Clinton would not try to rein in the power of Wall Street, while 15 percent said she would succeed and 21 percent said she would try to and fail, according to a survey from Quinnipiac University

Nearly two-thirds — 63 percent — said she would not try to remove secret money from politics. Nine percent said she would succeed, and 18 percent said she would try to and fail.

About a quarter — 24 percent — said Mr. Trump would be able to build a wall along the United States’ southern border and have Mexico pay for it, compared to 39 percent who said he would try and fail and 29 percent who said he wouldn’t try.

Nineteen percent said Mr. Trump would be able to deport the approximately 11 million illegal immigrants in the country, compared to 45 percent who said he would try and fail and 29 percent who said he wouldn’t try.

And 29 percent said Mr. Trump would be able to temporarily ban non-citizen Muslims from entering the U.S., while 42 percent said he would try and fail and 21 percent said he wouldn’t try.

“No matter which candidate you pick, you can cut the cynicism with a knife,” said Tim Malloy, assistant director of the Quinnipiac University Poll.

“Will Donald Trump build that border wall or toss 11 million illegal immigrants out of the country? Voters believe that as much as they believe Hillary Clinton will police Wall Street or stop the flow of outside money into the pockets of politicians,” Mr. Malloy said.

“There are grand promises that stoke enthusiasm at rallies, and then there is reality. Voters say Trump would try and likely fail, while Clinton would not even try,” Mr. Malloy said.