( CNN ) -- Nearly half of the nation 's states have new voting measures that could stop some Latinos from heading to the polls in November , a civil rights group said Monday . `` This year , an unprecedented number of voting restrictions impose barriers to voting that disproportionately affect the Latino community , '' said a report from Advancement Project , which has also sued to block such voting measures in a number of states . Monday 's report from the organization , which pushes to protect voting rights , was the latest volley in a national battle over such measures that splits largely along party lines . Advancement Project 's report points to three different types of efforts in 23 states that it says will impact eligible Latino voters : efforts to purge rolls of non-citizen voters , proof of citizenship requirements for voter registration and photo ID laws . Campaigns battle over narrow groups of voters . It is difficult to calculate exactly how many Latinos could be affected , Katherine Culliton-Gonzalez , director of voter protection for Advancement Project , told reporters in a conference call Monday . Based on U.S. Census population data of eligible Latino voters in the 23 states with what Advancement Project calls `` voter suppression policies , '' she said , the organization estimates that obstacles could deter or prevent more than 10 million Latino citizens from registering and voting in the 2012 elections . Romney steps up effort to woo Latino voters . But one conservative Hispanic leader said Monday that the group 's estimate sounds `` completely ridiculous . '' `` It is a number that simply is not believable , '' said Rosario Marin , an advisory committee member for the Hispanic Leadership Network and a former treasurer of the United States during President George W. Bush 's administration . Advancement Project said its figure was a conservative estimate , pointing to letters it says Florida officials sent to thousands of registered voters asking them to prove their citizenship or be purged from the voting rolls . The intimidating impact of such letters extends far beyond those directly involved , Culliton-Gonzalez said Monday . `` Discrimination works that way , '' she said . `` It exponentially affects the entire community . '' And , she said , it can influence the results of the election . But Marin said voter ID laws were a positive step . `` It 's something very important so that we have integrity of the vote . When it is not done , there are questions about whether in reality people have the right to vote , '' she said . `` When we have the identification it eliminates the need for any questions . '' Advancement Project 's report said the organization 's arguments are based on an analysis of government documents and data , media reports and scholarly works . The organization has been involved in a number of legal challenges to recent state voting measures , including a high-profile case over Pennsylvania 's controversial voter ID law , which requires voters to present a state-issued photo ID . Earlier this month , the Pennsylvania Supreme Court sent the lawsuit back to a lower court to assess the availability of alternative forms of identification and whether the new law disenfranchises voters . The law 's backers argue that it strengthens voting procedures and protects against fraud . Gov . Tom Corbett , a Republican , signed the law in March after its passage largely along party lines . He said it `` sets a simple and clear standard to protect the integrity of our elections . '' Justice Department approves New Hampshire voter law . In its report Monday , Advancement Project countered that evidence shows that in-person voter fraud is `` virtually nonexistent . '' `` This is an overly broad method of trying to solve a problem that does n't even exist that has a disparate impact on people of color , '' Culliton-Gonzalez said . Debate over the Pennsylvania measure and other similar efforts across the country has largely split along party lines . Republican supporters have argued that the laws would help to fight fraud , while Democrats make the case that the new measures aid Republicans in the voting booth by limiting minority turnout in crucial battleground states . CNN 's Halimah Abdullah , David Ariosto and the CNN Political Unit contributed to this report .
A new report is the latest volley in a battle over state voting rules . Such measures `` disproportionately affect the Latino community , '' group says . The civil rights group is involved in lawsuits challenging the laws . A conservative Hispanic leader says the report 's assertion is `` not believable ''