Liberals are just grasping at any issue that takes voters minds off the economy; and make Romney seem like an evil wall street capitalist shark.
I'll tell you what is in Romney's tax returns, probably the same stuff that was in the past 2 years! Since 2008, he has been a private citizen without a full time job. His income is derived from speeches and investments. Should he disclose every investment he's made in his lifetime? Maybe or maybe not.
He's been involved with a lot of businesses; and some of those takeovers have been controversial. Liberals are just trying to grab onto anything controversial that would make Romney look bad based on his past investments, and business operations.
He probably has paid less in Income tax because he hasn't had a full time job since 2002. Most of his taxes are capital gains. It might seem lower than the average middle class worker, but that is the nature of the industry he was working in. Romney retired from full-time work in 2002, so why would he have to pay taxes if he had very limited income tax?
If his business ethics leave something to be desired, then he does not deserve to be President. Such is even more important than taxes.