I don't think so. I believe privacy is involved, but there are other important elements too.
In having public disclosure of ALL campaign contributions you have the best control over people or groups attempting to "buy" influence. We need to know the politicians base fortune as well as how he or she got the fortune. If I suddenly discovered a fortune in my work, my employer would want to know if I sold company secrets to the enemy. Now I agree about privacy, you don't need to know this about everyone, only the people you place a great deal of trust in. (I worked in a field where I had access to nuclear weapon designs, should I hold that my income tax records and bank accounts are private, or should I have sighed on to voluntary disclosure?) Note, I emphasize voluntary, these politicians can hold out if they have something to hide.
Campaign contributions are open to scrutiny as a result of FEC Regs - and they should be.
But, I believe Ralph Nader's personal records should remain private.