In a scathing analysis of the immigration amnesty bill, William Rusher offers an interesting explanation of Republican and Democratic bipartisanism at work:

It is extremely difficult to focus the attention of the people at large on any policy, however bad, that is wanted eagerly by an influential minority.

The policy in question -- namely, to legalize the status of the 10 or 15 million illegal aliens in this country, keep them working here for peanuts, put them on track for citizenship and open the doors to millions more (all in the name of "reform") -- has the support of not one, but two powerful minorities: professional Democratic politicians, who calculate that the great majority of them will vote Democrat if they ever become citizens, and greedy businessmen (mostly Republican), who want their cheap labor no matter what the social consequences for the country.

My fellow columnist M. Stanton Evans is responsible for the brilliant perception that the Republicans (in John Stuart Mill's formulation, transposed from Britain) are "the stupid party" and the Democrats are "the evil party." Every once in a while they get together and hatch some policy that is both stupid and evil. This is called "bipartisanship," and the immigration reform bill was a spectacular example of it.

While I think both evil and stupidity exists in both parties, the above might go a long way towards explain a lot of things. In particular, the constant frustration which can be created by an overly rigorous application of Hanlon's Razor:

Never attribute to malice that which can be adequately explained by stupidity.

Never attribute to malice that which can be adequately explained by stupidity, but don't rule out malice.

We're all in this together!