Fair enough but that's not really the issue at hand here.
If the issue is outreach to African Americans, equality is a big issue. That is what this boils down to; income being treated as income.
I'm going to disagree with you in two ways. First it isn't about finances, it's about governmental "penalties" of taxes. If you found out a plumber across town wasn't paying the same license fee you were paying and was paying less, you'd be concerned that they could undercut you, right? Put another way, I don't think it is an abstract argument that every dollar you pay that I don't shifts more of the of the tax burden on you. Yet the police don't show up to your home faster, your roads probably aren't that much smoother, and your water isn't any more cleaner than mine. Yet you're paying more.
In the 2nd place, you're speaking on this from a laboratory perspective. On a Tuesday in April of 2013, you may be right. But since politics is about winning elections, candidates broadcast what serves them well and ignore what doesn't. Remember Willie Horton? I don't point it out because it's a republican ad but because it's the most egregious example... Mike Dukakis released Willie Horton from prison 10 times on weekend passes. On one of the passes, he murdered and raped a family. Bush Sr. benefitted from that ad being run over and over (his campaign didn't run it but ran one similar)
The Living Room Candidate - Commercials - 1988 - Family/Children
Here is the Horton ad (he never referred to himself as "Willie"--he called himself "William" but the group that put it together went with the simpler "Willie")
[ame=http://www.youtube.com/watch?v=Io9KMSSEZ0Y]Willie Horton 1988 Attack Ad - YouTube[/ame]
Anyway, President Dukakis would have no power to release a single prisoner on a weekend pass from federal prison. Yet this was likely one of the most memorable ads from that election year (that and Dukakis on a tank) and it had nothing to do with the Presidency.
Opportunity equality is important if one of the candidates brings it up; it gets legs if it's found out to be the case. In the case of Governor Romney...it grew legs, wings, and ran a 4.2-forty.
I have stated all along that I am for a flat tax for all with 0 deductions except for food. So ultimately I guess im on your side on the issue but this is not a make or break issue imo.
Again, if the issue is reaching out to blacks, it's whats important to them. Selling the flat tax would be great....all income is treated equally; no deductions for this type of income vs. that type of income. I really don't recall, was that Romney's plan?