Newark Mayor Cory Booker likely can’t be caught by his Democratic primary opponents in the final week of the New Jersey Senate special election.

According to a poll released Wednesday from the Quinnipiac University Polling Institute, Booker led the three other candidates with 54 percent among likely Democratic primary voters. Of the other three candidates, Rep. Frank Pallone Jr. took 17 percent, Rep. Rush D. Holt took 15 percent, and state Speaker Sheila Oliver took 5 percent.

Conservative activist Steve Lonegan held an even bigger lead in the poll of likely Republican primary voters, and he appears headed for a showdown with Booker.

The Democrat starts out with a big edge in this Democratic-leaning state. In the poll’s general election matchup, Booker led Lonegan 54 percent to 29 percent.

“Unless the sky falls, Newark Mayor Cory Booker can start looking for a Washington apartment,” Quinnipiac Polling Director Maurice Carroll said in a release. “He dominates both the Democratic primary and a general election against Steve Lonegan.”

The primaries will be held Aug. 13. The special election to fill the remaining term of the late Sen. Frank R. Lautenberg will be held Oct. 16.

Surveys were conducted Aug. 1-5 of 388 likely Democratic primary voters with a 5-point margin of error and 257 likely Republican primary voters with a 6.1-point margin of error.