“This is an opening for Republicans because Latino optimism about expanding health care is starting to wane like the rest of the population,” said pollster Gabriel Sanchez, an associate professor of political science at the University of New Mexico. “The Republican strategy of hammering at the health care law could work among Latinos.”

Indeed, in the first publicly released survey analyzing Obamacare’s impact on Hispanics since the launch, 34 percent said health care costs will get worse under the law. The Latino Decisions poll of 300 Hispanic adults in Colorado from Oct. 14 to 18 also showed slight downturns in views of the law’s impact on the quality of health care and the ability of people to get or keep insurance.

Influencing those negative views is Spanish-language media, which frequently sympathizes with the administration’s goal of immigration reform but has been documenting the health care law’s troubled rollout. Univision, for example, interviewed a Brooklyn bakery owner whose phone number was mistakenly listed as a contact for ACA enrollment.

A leading Hispanic Republican critic of the health care law and a potential presidential contender in 2016, Sen. Marco Rubio of Florida, has seized on the delay of the Spanish-language website.