There’s been much back and forth about that question in recent weeks. Today, there’s news on this front. He might be chair of the appropriations committee in a Republican House. And today Jerry Lewis endorses an earmark moratorium in the next Congress. He writes:

To address these great budget challenges, we must not be distracted by a damaging and divisive internal debate on earmarks. Regardless of individual positions on this, the fact remains that they have become a symbol of Washington spending. Our efforts simply must not be focused on the fraction of a percent of the federal budget represented by these projects — but on the tremendous task of cutting discretionary spending.
To this end, I believe it is necessary to take the issue off the table. I spoke vigorously in support of the existing moratorium. It is my intention to continue to support the Republican leadership and the conference in decisions to leave the current moratorium in placemoving forward.

Now, obviously, Lewis is ranking Republican and he wants to be chairman. And this is Jerry Lewis campaigning for the job. That said: He clearly thinks he has to swear off earmarks to become appropriations chair in a Republican Congress. It suggests Republicans are that committed on the issue. Strikes me as a big deal if you’re gauging House GOP seriousness on the issue.