Sen. Barack Obama has released his tax returns for the years 2000-2006 and they can be viewed online. It's within his pledge for more transparency in government. Sen. Hillary Clinton has yet to release her tax returns, stating that she will do so a few days before the Pennsylvania primary and, at the same time, claiming that the personal disclosure forms she has filed as a Senator should suffice.

Presidential candidates have been releasing their tax returns for years now -- it's part of the vetting process. Why should things be any different for Sen. Clinton? If anything, the litmus test for Sen. Clinton should be even higher, seeing as how there are numerous questions surrounding her tax returns, among them the nature and amount of offshore tax shelter income and her and her husband's actual income, which has apparently grown exponentially in the years since he left the Oval Office.

Mark Halperin of TIME magazine sums it up well.

It's also essential that Sen. Clinton release a list of donors to her husband's Presidential Library. With numbers such as a $130 million contribution from the Saudis swirling around, it's important for the American public to get a real accounting. It will then be up to the American public to decide whether such large cash donations to Mr. Clinton's library most likely came with strings attached.