I'm glad you got your talking points from Talking Point Memo. You just can't make his kind of shit up!
TPM has a paywalled private area called "Prime". I joined there a couple of months ago because I was interested, and because I wanted to express support for the site's founder. TPM is left-leaning generally, which I knew about, but I find the site informative.
I got along pretty well with most of the people there -- at first. To be honest, I found the place rather dull due to little disagreement on anything. Anyway, as soon as Newtown happened and people started gun control discussions, I learned first hand that the private forum is REALLY left-leaning.
I am literally the only person on this forum who doesn't think gun owners are evil and that we should institute more laws immediately. And I'm far from an extremist on the subject. Every thread on the topic consists either of an echo chamber of agreement, or if I post, everyone dogpiling me.
It's pretty amazing.