Just minutes before an explosive vote on whether climate change is real, Republicans received a surprising message from Sen. James Inhofe James (Jim) Mountain InhofeChamber of Commerce endorses McSally for reelection Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Top admiral: 'No condition' where US should conduct nuclear test 'at this time' MORE.

“Vote yes.”

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The Oklahoma Republican, derided by the left as Congress’s leading “denier” of climate science, had decided the night before, while huddled in his office with staffers, that he would support an amendment from Sen. Sheldon Whitehouse Sheldon WhitehouseLWCF modernization: Restoring the promise Restaurant owner defends calamari as 'bipartisan' after Democratic convention appearance Warren calls on McConnell to bring Senate back to address Postal Service MORE (D-R.I.) stating, “climate change is real and not a hoax.”

“Well, that’s true,” Inhofe said. “I can vote for that.”

“I think we should get our whole caucus to vote for this,” he added, according to a top aide.

Inhofe and his aides drew up 54 notecards — one for every Republican in the Senate — urging them to vote for the amendment, which Democrats were putting forward as an addition to the Keystone XL pipeline bill.

The card said:

Inhofe recommends a Yes vote because

1. The climate has always been changing and

2. There is no consensus that human actions and emissions levels have significant, negative impacts on global climate change

Inhofe informed only Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) of his plan, fearing Democrats would revise the amendment if they got wind of it.

“If they started thinking about it, he could have reworded it in such a way that it could have been a totally different thing,” Inhofe said.

When the time came for the vote, Inhofe approached Whitehouse on the Senate floor and told him he wanted to become a co-sponsor.

“You should have seen the look on his face,” said the Inhofe aide.

Inhofe reasoned that the climate has always changed, and said on the Senate floor that there is “biblical evidence” supporting that view.

Whitehouse, who is co-chairman of a bicameral climate change caucus, acknowledged the move took him by surprise but told The Hill he wouldn’t go back and change the amendment, even if he could.

Inhofe’s “little trick of twisting the rhetoric a bit” gave Republicans the political cover they needed to vote for the amendment, Whitehouse said.

The result of the unlikely Inhofe-Whitehouse pairing was an overwhelming 98-1 Senate vote endorsing the view that climate change is “not a hoax,” foiling the first attempt by Democrats to portray the Republican Party as anti-science ahead of the 2016 presidential elections.

Later that day, Republicans blocked two amendments stating that human beings contribute to climate change, giving ammunition to Democrats who say the GOP is standing in the way of efforts to reduce carbon emissions and halt the warming of the planet.

But it was the first vote of the day that became the talk of Washington.

Did Republicans beat Democrats at their own game or make a tactical error they — and their 2016 hopefuls — will live to regret?

Whitehouse said the vote was the “first public discussion of climate change” in the Senate in years and “a very good first step.”

“The fact [is] that we got 98-1 and have rid ourselves forever [of] the argument that there is not climate change,” he said.

Sen. Barbara Boxer Barbara Levy BoxerThe Hill's Morning Report - Presented by Facebook - Biden, Harris launch Trump offensive in first joint appearance Bottom line Polls show big bounce to Biden ahead of Super Tuesday MORE (D-Calif.) has a more pointed assessment.

“I wasn’t surprised [by the vote], because I knew [Republicans] are losing the public relations battle by being so Neanderthal on the issue,” she said.

The climate change debate has stirred anxiety in corners of the GOP, with some fearing the “denier” rhetoric from Democrats could be politically damaging in the 2016 elections.

“From a Republican Party point of view, if you don’t embrace what seems to be an overwhelming body of scientific evidence, you risk the idea that you are anti-science,” said Sen. Lindsey Graham Lindsey Olin GrahamMomentum growing among Republicans for Supreme Court vote before Election Day Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Warning signs flash for Lindsey Graham in South Carolina MORE (R-S.C.), who is considering a run for the White House in 2016.

“So the risk you run is that people don’t just look at you as outside the norm when it comes to evaluating science; it runs deeper.”

Fifteen Senate Republicans, several of them up for reelection in blue states, voted for a second amendment that said humans contribute to climate change. Among the supporters: Graham and Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.), another possible candidate for the White House in 2016.

Five Republicans went one step further, voting for a third amendment from Sen. Brian Schatz (D-Hawaii) that said humans “significantly” contribute to climate change. Two of the “yes” votes came from Sens. Mark Kirk Mark Steven KirkLiberal veterans group urges Biden to name Duckworth VP On the Trail: Senate GOP hopefuls tie themselves to Trump Biden campaign releases video to explain 'what really happened in Ukraine' MORE (R-Ill.) and Kelly Ayotte Kelly Ann AyotteBottom line Bottom line Bottom Line MORE (R-N.H.), who are up for reelection in 2016.

“Democrats are going to continue to play games with them until they are unified in approach. Sen. Schatz and others were trying to see how many different ways to chip away at the GOP position,” said Ford O’Connell, a Republican strategist.

“Democrats are trolling Republicans extremely hard on this issue.”

By voting for Whitehouse’s amendment, O’Connell added, “Republicans were making sure they don’t handcuff a 2016 GOP nominee.”

Republicans, for their part, said they are confident that voters will see through the political gamesmanship.

Senate Majority Whip John Cornyn John CornynCalls grow for Biden to expand election map in final sprint Bipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection MORE (R-Texas) dubbed the “hoax” amendment a “ ‘gotcha’ vote,” and an Inhofe aide said the senator had turned the tables on the Democrats.

“He decided that this was a moment to make people aware of the game they were playing,” the aide said.

Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE (R-Ala.) mocked Democrats for “trying to create something so they could run around and say, ‘These are deniers.’ ”

Still, there was one member of the Republican conference who refused to go along with Inhofe’s gambit: Sen. Roger Wicker Roger Frederick WickerHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' Republican Senators raise concerns over Oracle-TikTok deal MORE (R-Miss.), the chairman of the campaign committee for Senate Republicans.

“It was, to me, an attempt to play a political word game to slow the bill down, and I decided not to play along,” Wicker told The Hill.

Whitehouse suggested Inhofe’s strategy was too clever by half and said voters understand perfectly well that saying “climate change is real” means humans contribute.

“I think that for the people who thought this was a cute dodge, I think most Americans take a look at that vote and make exactly the same conclusion,” he said.

Whitehouse joked he wants to have 100 votes on climate change before the 2016 election cycle, perhaps by pitting the GOP’s views against popular institutions like the military or the Catholic Church.

“Do they really want to reject the views of Pope Francis on this subject?” Whitehouse said.