Results from this poll seem to be reliable. Public Policy Polling (PPP) who is a U.S. polling firm based in Raleigh, North Carolina released a PDF report listing the results of a national survey looking at common conspiracy theories.
The exact question:
Do you believe that shape-shifting reptilian people control our world by taking on human form and gaining political power to manipulate our societies, or not?
Answers:
Do: 4%
Do not: 88%
Not sure: 7%
The wire.com took the findings and arranged them from most-to least-believed:
Conspiracy Percent believing Number of Americans believing
JFK was killed by conspiracy 51 percent 160,096,160
Bush intentionally misled on Iraq WMDs 44 percent 138,122,178
Global warming is a hoax 37 percent 116,148,195
Aliens exist 29 percent 91,035,072
New World Order 28 percent 87,895,931
Hussein was involved in 9/11 28 percent 87,895,931
A UFO crashed at Roswell 21 percent 65,921,948
Vaccines are linked to autism 20 percent 62,782,808
The government controls minds with TV 15 percent 47,087,106
Medical industry invents diseases 15 percent 47,087,106
CIA developed crack 14 percent 43,947,966
Bigfoot exists 14 percent 43,947,966
Obama is the Antichrist 13 percent 40,808,825
The government allowed 9/11 11 percent 34,530,544
Fluoride is dangerous 9 percent 28,252,264
The moon landing was faked 7 percent 21,973,983
Bin Laden is alive 6 percent 18,834,842
Airplane contrails are sinister chemicals 5 percent 15,695,702
McCartney died in 1966 5 percent 15,695,702
Lizard people control politics 4 percent 12,556,562
The PDF report also mentioned that isurveyed 1,247 registered voters and has a margin of error of 2.8 percent:
PPP surveyed 1,247 registered American voters from March 27th to 30th. The margin of
error for the overall sample is +/-2.8%. This poll was not paid for or authorized by any
campaign or political organization. PPP surveys are conducted through automated
telephone interviews.
As for Public Policy Polling (PPP), it can be considered as accurate since a Fordham University report released ranked the firm first among 28 organizations for the accuracy of its final, national estimates. It also a great track record and history in being accurate.