Here is Carl Sagan testifying before congress in 1985 https://www.youtube.com/watch?v=Wp-WiNXH6hI
Admittedly this hasn't necessarily been as strongly polarizing as it was during the 2010s, there was a time that it was a bipartisan issue that unified both parties in the interest of reducing foreign energy dependence. https://www.youtube.com/watch?v=yzDjjUAt3zc