Christie has 64 percent to Buono's 30 percent support in a Quinnipiac University survey of likely voters.
He leads by similar margins with both men and women, and even takes 35 percent of Democrats away from Buono.
There's little room for the Democrat to make up ground in the poll, as only 5 percent of likely voters polled are undecided and only 8 percent say there is a good chance they'll change their mind before November.
Buono has struggled to gain traction in the race and still, as this poll shows, is relatively unknown. Forty percent of respondents don't know enough about her to have an opinion, while a plurality of those who do have an opinion view her negatively.
Christie, conversely, is popular in his home state, with 67 percent of respondents viewing him favorably. Even Democrats are relatively friendly towards him, with 45 percent viewing him favorably while 47 percent view him negatively.
A slight plurality of respondents, 43 percent, say Christie should run for president in 2016 — a prospect considered highly likely for the governor.
He's known to be contemplating a run, though he's currently focused on achieving a smashing victory in his November reelection fight.
If he manages to turn out a win margin like the one reflected in the Quinnipiac poll, the final number should help him boost his argument among Republican voters nationwide as the most electable candidate in a general election, which he's hoping will be a strong selling point in a Republican primary.
The Quinnipiac survey was conducted among 1,249 New Jersey likely voters from Sept. 19-22 and has a margin of error of plus or minus 2.8 percentage points.