The SNP now have the 'Coatbridge vote' which used to be SLAB.
People opened their eyes to SLAB when McConnell became FM & Reid become the yahoos chairman.
When McConnell starting introducing so-called anti-sectarian legislation who was he targeting ? And it was fairly obvious(to me anyway) Reid was involved in some way in our financial downfall whether with HMRC and/or LBG.
Many turned their back on SLAB and went to the SNP. Many yahoos did likewise as they always vote together for whoever is in government and try to get their own into positions of power
I don't think the SNP was always anti-Rangers but those in control today are generally anti-Rangers such as Michael Matheson, Brendan O'Hara, Roseanna Cunningham etc