Dave Camp wanted to cap the marginal tax rate at 25%, but the numbers didn't work out. He had to settle for 35% for the top bracket, and that was even with limiting deductions.
Why wasn't the 25% goal attainable? Because it was based on a fantasy. Our spending is too high to lower taxes, and our efforts to lower spending haven't gone so well. Camp aimed for all the revenue we're currently getting now, and he didn't use the questionable 'dynamic scoring' that lets legislators project overly optimistic numbers. (I'm referring to you, Paul Ryan.) This is what the reality of tax cuts looks like.
I don't know if it will have any impact on GOP campaigns this year or in 2016. GOP budgets and tax proposals have been pie-in-the-sky for 14 years now. This is the one exception, so can I really project that it will make a difference? No, I can't. Kudos to Dave Camp nonetheless.
Extras. I couldn't get a flat tax to work either, and now I have company. Herman Cain's plan was a farce. A conservative calls for the end of special treatment for capital gains. Good for him, but I beat him by several years.