Generally, when it comes to trying to convert liberals, I follow the adage "never try to teach a pig to sing. It doesn't work and only ends up annoying the pig."
That being said, change is possible, at least for some people. I never was an outright "anti-" but I sure was a long-haired liberal bastard. I marched in the streets. I worked for lefty organizations. I didn't have a problem banning scary "assault weapons" and I thought the primary role of government was to solve societal ills.
I credit my personal "awakening" to three things:
1. Being ready - over the years I had accumulated enough facts that didn't fit and that I just couldn't ignore any longer.
2. Reading "Atlas Shrugged."
3. Having a co-worker take me to the range, get me into pistol shooting and very quickly thereafter into an LTC.
Once I got into shooting, and began to experience the insanity of the MA gun laws and the anti-gun bigotry of the left firsthand, I began to see even more clearly how insane the current political/social situation is in western civilization. The journey continues.
Yup, I'm outing myself. This is my past. I was what I was and I am what I am and I make apologies to no one.