My problem is I want to conduct extraneous empirical analysis:
The Senate on Wednesday voted that “climate change is real and is not a hoax” as Democrats used the Keystone XL pipeline debate to force votes on the politically charged issue ahead of the 2016 elections.
The “hoax” amendment to the pipeline bill from Sen. Sheldon Whitehouse (D-R.I.) passed 98-1, with only Mississippi Sen. Roger Wicker, the chairman of the Senate Republican campaign arm, voting “no.”
Republicans backed Inhofe’s stance in a second vote, rejecting an amendment from Sen. Brian Schatz (D-Hawaii) that stated, “climate change is real and human activity significantly contributes to climate change.”
The “significantly” in the provision is what many Republicans pointed to as a point of contention as they blocked the amendment in a 50-49 vote, short of the 60 that was needed for approval. ...
In an attempt to provide political cover for Republicans, Sen. John Hoeven (R-N.D.) put forward an alternative that expressed the sense of the Senate that the Keystone oil pipeline would not significantly impact the environment or contribute to global emissions. The provision included a line stating that humans contribute to climate change but without the word “significantly.”
Fifteen Republicans voted for that amendment ...
Sen. Bernie Sanders (I-Vt.) ... said the Senate would vote Thursday on his amendment, which goes one step further by stating that climate change is “already causing severe problems all over the world, we have a window of opportunity and we have to transform our energy system away from fossil fuels to energy efficiency.”
Wednesday’s votes came after senators duked it out on the Senate floor in a wide-ranging debate over climate change and its relationship — or lack thereof — to the $8 billion pipeline project, which is undergoing federal review.
“It starts by admitting you have a problem, just like many other areas of human life,” Whitehouse said of Republicans’ skepticism on climate change.
In case you want to write a paper on all this, I'll get you started. Here is the linear probability model of the votes on the Hoeven amendment regressed on ideology and political party using data from govtrack.us. The dependent variable equals 1 for yea and 0 for nay. Political party and ideology, which ranges from zero (liberal) to one (conservative), explains 62% of the votes.