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A poll on released Sunday shows Hillary Clinton having an advantage of eight percentage points over Senator Bernie Sanders of Vermont in the Massachusetts Democratic primary on Tuesday.

The poll, by Suffolk University, showed Mrs. Clinton with 50 percent of likely Democratic voters, while Mr. Sanders had 42 percent. The poll has a margin of sampling error of plus or minus four percentage points.

A poll by MassINC Polling Group released on Friday, before Mrs. Clinton’s decisive victory in the South Carolina primary on Saturday, showed Mrs. Clinton having an edge of five percentage points.

The Suffolk poll, which surveyed 500 people, was conducted from Thursday to Saturday.

Both candidates are campaigning in the state on Monday.