I always laugh at the "tax breaks " thing.
The funny thing is that if your combined salary is more than 149k there is a tax PENALTY. So if both of you make around 74k each (which isnt an unattainable goal) not only does the benefit disappear, you get penalized.
http://www.financialsamurai.com/at-what-income-level-does-the-marriage-penalty-tax-kick-in/
This is mostly assuming a bunch of shyt just to further an agenda.