Weren’t about 20-30% so-called Evangelicals voted for Gore and Kerry anyway? So, I have a feeling that these ‘Evangelicals’ already vote along liberal lines in the first place.
It used to be much higher. They thought Republicans shunned God. The big 3 is gone, and information is breaking the family tradition.
A generation or two ago, I'd guess around 80% of Evangelicals voted Democrat. This is because back then most Evangelicals lived in the South, and "The Solid South" still detested "The Party Of Lincoln". Things have changed since then, but there are still plenty of Southerners - especially the oldest ones - who haven't seen the light, politically speaking, that most of their neighbors have.
And back then, a similar proportion of Catholics reflexively voted Democrat as well. And similarly today, a significant percentage (larger than "20-30%" I'd guess) of them still have not seen the light as well.
Hey, even I voted for a Dem or two on the state level back in the early 80s!