What's a Clean Power Plan? Most voters couldn't tell you, despite it being the centerpiece of the president's climate change agenda and a thorn in the side for lawmakers from coal states.

New polling data released Thursday by the University of Maryland revealed the knowledge gap exists between Republicans and Democrats.

"The Clean Power Plan is not a household word in America just yet," according to a survey conducted by the University of Maryland's Program for Public Consultation targeting Americans' views of President Obama's clean energy agenda.

The poll appears to support critics of the climate plan, who say climate change isn't a priority for the majority of voters going into the 2016 elections, despite a massive push by environmental groups to change that.

The survey found that 69 percent of respondents never heard of, or knew little about the far-reaching regulatory plan. The Clean Power Plan calls on states to cut their greenhouse gas emissions by a third by 2030.

The plan is being heavily contested in the courts by 30 states and dozens of industry, unions and business groups. The Supreme Court stayed the plan in February until all court action has concluded. Oral arguments begin early next month in the D.C. Circuit Court of Appeals.

Only 6 percent of the respondents heard a lot about the plan, and 24 percent said they heard only some about it.

The findings were the same among Democrats, Republicans and Independents. However, after researchers briefed participants about the rule that changed, Democrats overwhelmingly supported it, while less than half of Republicans favored the climate regulations.

The poll was released as nations, business groups and activist organization gather in Washington to discuss the next steps after the landmark climate agreement in Paris last year. The University of Maryland is one of the hosts of the major summit.