Megan McArdle says supply-siders -- the ones who say tax cuts pay for themselves -- are out of the mainstream of the Republican party:
I'm all for someone taking on the sillier kind of supply siders who fanny about claiming that tax cuts increase tax revenue, but they've been rather thin on the ground lately. ...
The second three may be a "motley collection of names" and have little influence over the party, but the first four? Are Bush, McCain, Romney, and Giuliani part of the "barking moonbats"? [yes...] I agree they are making a silly assertion, but don't they run counter to the claim that nobody of importance in the party tries to sell tax cuts by saying they pay for themselves?
And, right on cue, in today's Washington Times we have this piece of hackery:
Tax cut extension needed, by David Limbaugh, Commentary, Washington Times: ...Contrary to liberal propaganda, the Reagan tax cuts led to dramatic increases in federal revenues even after adjusting for inflation. ...
Since President Bush's tax cuts took effect, Democrats have been condemning them because of their alleged responsibility for soaring deficits. ... Recent reports definitively confirm ... federal revenues increasing; the deficits are decreasing, just as in the later Reagan years. ... It's past time to extend the Bush tax cuts.
The idea that tax cuts pay for themselves, wrong as it is, is still being actively promoted as part of the sales pitch to cut taxes. It may not be official party policy, but influential members of the Republican party are more than willing to play along and even help to promote this idea, and they do so even though they ought be aware by now that there's no evidence to support such claims.
Update: Brendan Nyhan extends the list of statements from the administration claiming that tax cuts pay for themselves.