A new poll shows Deb Fischer has a 55 percent to 34 percent lead over Bob Kerrey in the race for the U.S. Senate.
Nearly 1,300 people were surveyed. the poll has a margin of error of plus or minus 2.756 percent, Fischerís campaign office said.
Kerrey's campaign manager Chris Triebsch said polls are increasingly inaccurate because one-third of the population uses cellphones, but they are not questioned proportionately in polls.
Triebsch cited a recent New York Times analysis of two presidential polls that differed by 5-points per candidate (10 point overall), depending on how many cell phone users were contacted.
Triebsch also said the We Ask America polls have shown a bias toward Republicans, according to the Daily Kos, a liberal blogsite.
"The race is much closer," Triebsch said.
In June, Fischer's campaign said she was ahead by 25 points, based on a poll of 500 people.
The latest, more comprehensive poll was authorized by the Omaha Chamber of Commerce, Lincoln Chamber of Commerce and the Nebraska Chamber of Commerce, and conducted by the research firm We Ask America.
Fischer's campaign manager Aaron Trost said Kerrey "has tried everything imaginable to avoid talking about his unquestionably liberal record and his support for President Obamaís failed policies."
This report was updated Aug. 19 with comments from the Kerrey camp. -Editor.