The marriage penalty was removed with Bush’s initial tax cuts in 2001 and certainly in the 2003 tax cuts. So, I hate to say you’re wrong and I do know what I am talking about. The tax penalty is on single people.
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You are wrong. The marriage penalty was removed only for certain tax brackets, those below 25%.
There is also a marriage penalty for capital losses, for some real estate investments, credits (adoption credit, child tax credit, earned income credit), IRA deductions, Roth IRA conversions, business deductions (Section 179), taxability of Social Security benefits.
I know there are more, but I'll let you do your own research. :)