LAS VEGAS (AP) - Republican Brian Sandoval has a double-digit lead over Democrat Rory Reid in the Nevada governor's race, according to a statewide poll released Saturday.

The poll, conducted for the Las Vegas Review-Journal and KLAS-TV, found that Sandoval had 50 percent to Reid's 31 percent. Fourteen percent were undecided, 3 percent were for "none of these candidates" and 2 percent were for others.

Sandoval's 19 percentage-point lead compares with an 11 percentage-point margin he held in a similar poll two weeks ago and his 14 percentage-point edge in early June.

The telephone survey of 625 registered voters was conducted Monday through Wednesday by Mason-Dixon Polling & Research. It has a margin of error of plus or minus 4 percentage points.

Former Nevada state Archivist Guy Rocha said Reid, who is from Las Vegas, needs to improve his standing in Clark County against Sandoval, who is from Reno.

In Clark County, 45 percent of respondents supported Sandoval and 36 percent favored Reid, with 14 percent undecided.

"Any poll that comes in that Rory Reid is losing Clark County, he is done," Rocha said.

Reid spokesman Mike Trask downplayed the poll results, saying other polls show Reid much closer.

"I think that just shows the irrelevancy of early polling," he said.

Sandoval spokeswoman Mary-Sarah Kinner welcomed the latest results.

"Brian is encouraged by the people he is meeting on the campaign trail and the support he is receiving," she said. "But there is work to be done before November."