A new poll shows Latinos -- a fast-growing and key demographic in American elections -- aren't as fond of Obamacare as they once were.

The Pew Research Center poll showed Hispanics are split on whether they approve of President Obama's health-care law, with 47 percent approving and 47 percent disapproving.

The numbers are notable because Latinos have generally been among the health-care law's chief supporters. Other polls have shown they supported the law by a 2-to-1 margin, and a September 2013 poll, before the law's implementation, showed 61 percent of Hispanics approved of it.

Another key minority group that tilts strongly Democratic -- African American voters -- back the law 77-18.

Other polls show a smaller shift when it comes to Latinos. The Kaiser Family Foundation, which has been doing regular polls on Obamacare, shows 46 percent of Latinos have a favorable view of Obamacare, with 29 percent having an unfavorable one. In September, the same poll showed a 54-24 split.

Republicans have been struggling mightily with Latino voters, and given that their 2014 messaging is likely to focus heavily on Obamacare, the new numbers suggest such a message won't hurt their chances are making up some ground among Hispanics.

The numbers are also important because Hispanics are one of the biggest uninsured groups, and getting them to enroll is important for the Obama Administration to meet its goal of universal coverage.

A recent Kasier Family Foundation study showed 31 percent of Hispanics are uninsured.

White voters are strongly against the law, with 33 percent supporting and 62 percent opposing it.