“Bipartisan support“ is, since we are well out of the pre-1990s realignment period, mostly a sign of low political salience, an issue that doesn't have much relevance to voting behavior to most of the public. Breadth (%) of support or opposition is far less important than depth (impact on voting, volunteering, and donating behavior), and this is an issue where the depth of support in the general public is near 0, where the depth of opposition from entrenched industry interests is high.