The former head of a Washington think tank specializing in immigration issues says that voter registration numbers in Texas and elsewhere may be inflated because of the presence of non-citizens on voter rolls.

David Simcox, former executive director of the Center for Immigration Studies, released a study Tuesday afternoon that said an estimated 1.8 million to 2.7 million non-citizen immigrants in the Unites States may be illegally registered to vote, thereby potentially influencing the outcome of the upcoming presidential and congressional elections.

The report also estimated that anywhere from 161,000 to 333,000 non-citizens may be registered to vote in Texas.

Calling the state’s political culture “a mix of the worst of Old South Dixieland politics and Latin American politics,” Mr. Simcox said Texas has a political history marked by election fraud, sometimes involving Mexican or Mexican-American voters.

Using Texas population estimates from the 2000 census, Mr. Simcox said his study found a disproportionately high number of registered voters when compared to the total number of eligible voters in six major metropolitan counties and five counties near the Mexican border, all having a high percentage of non-citizen residents.

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