Because he would never remove voters and he never lies.
Check it out:

Hispanics should not be afraid that their illegal relatives will be discovered and deported through Obamacare enrollment information, President Obama said Tuesday during an interview with Univision Deportes.

The Hill reports:

“Well, the main thing for people to know is that any information you get, you know, asked with respect to buying insurance, does not have anything to do with … the rules governing immigration,” Obama said. “And you know, you can qualify if you’re a legal resident, if you are … legally present in the United States.

“You know, if you have a family where some people are citizens or legally here, and others are not documented, the immigration people will never get that information.”

Adolf Falcon, the senior vice president of the National Alliance for Hispanic Health, told The Hill that Hispanic families are wary of Obama’s assurances because of his record on deportations.