That some Republicans are willing to see higher taxes for the sake of anti-tax purity is topsy-turvy enough. Adding to the vertigo: The Republicans (inside and outside the House) who fret about blurring the party’s definition are the ones who are doing most to blur it. They are the ones who are, in most cases, accusing Republican leaders of seeking to raise taxes when they are actually trying to cut taxes as much as they think possible — cut them, that is, from the levels the law already has in place for 2013. They’re the ones who are accusing most House Republicans of “caving” to the Democrats, even as some of them prefer that the Democrats get their way entirely. That’s where the convoluted politics of this moment have led us.