>>>I'm proud to be a liberal Democrat (it comes with education, you know)

Sorry, that's simply not true. Just look at the demographics of the Democratic base.

>>>and nobody besides my wife and I is providing me with any care & support.

In the joke the kittens are the democrats looking to society to support and care for them. The boy is the liberal in that he believes that he should provide that support rather than let them provide for themselves once mommie stops doing so.