And compared to other ethnic groups, a higher proportion of Mexicans are in the country on shaky legal ground and ineligible to vote, she says.
Menchaca was unexpected, as well, said professor Robert Smith of Baruch College's School of Public Affairs. He's "not one of the traditional Mexican leaders from the city's community," Smith said. "He wasn't an immigrant leader who worked his way up to community leader and then ran for office."
The El Paso, Texas, native went to college in California and moved to New York City in 2004. Running for office wasn't even in his plans as recently as last summer, Menchaca said.
Openly gay, Menchaca had been working as a liaison with the lesbian, gay, bisexual and transgender communities for City Council Speaker Christine Quinn's office when Superstorm Sandy struck a year ago. He got involved in his neighborhood recovery efforts. And "it gave me a whole new way of thinking about how important government was," he said.
Once he decided to run, the Mexican community "played a role in every part of this campaign," he said.
"Our first, most fierce volunteers were many of the mothers that lived in this community, that couldn't vote, undocumented, but wanted to get involved in political action, for the first time most of them, because they wanted to elect the first Mexican-American," he said.
Those mothers brought their American citizen sons and daughters, making sure they were registered to vote, and knocked on doors for get support for Menchaca.
Menchaca's district covers working-class Brooklyn neighborhoods that have a sizeable number of Mexican residents, along with Chinese and Puerto Rican populations. The 38th District incumbent he beat in the primary is a Puerto Rican woman.
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Follow Deepti Hajela at www.twitter.com/dhajela