The core disagreements seem more moralistic and personal security issues rather than corporate pandering. The gun manufacturing industry is small and weakly compared to the real players--healthcare, finance, tech, MIC. While the left loves to paint the NRA as evil--and it is a bit, and grossly mismanaged--it is at its core a grassroots organization; rural people and some others will not consent to giving up 2A or being disarmed, full stop. Likewise there are no shadowy "Big Abortion" interests propping up that side of things, nor am I able to think of anyone poised to profit by forbidding it.
That said, the no-compromise issues really do have the effect of shoving all the important stuff into the background...
That said, the no-compromise issues really do have the effect of shoving all the important stuff into the background...