How Should I Feel About "Tariff Earmarks"?

I'm not a big fan of earmarks generally.  Even if specific projects are defensible, the process just seems fundamentally flawed.  But what if the "earmark" is a suspension of a tariff duty?  As a free trader, shouldn't I support that?  According to this story, both Hillary Clinton and Barack Obama have engaged in the practice, taking money from companies who want a tariff reduction for specific products.  John McCain, on the other hand, does not:

John McCain, the likely Republican nominee, does not introduce tariff suspension bills under "a longstanding policy — no private relief bills or any bills for one person," spokeswoman Jill Hazelbaker said in an e-mail.

It's good to cut tariffs, right?  But is it good to cut tariffs as a special favor to well-connected lobbyists?  Tough call, but at least the process seems to be more transparent these days.