But I look forward to reading any numbers of before and after you share!
As for employer and occupation, we are legally required by the Federal Election Commission to do our best effort to gather the donor's employer and occupation. Doesn't have anything to do with taxes.
For this instance, the large photo background of Obama in action evokes more emotion than the formal portrait. Also, it's a very simple and clear call to action. In this case, the donation amounts are their add to cart.
It's also very important to understand how users got to the donation page. From the article, it would appear that most of the "sell" was done via other media (social, email, traditional links). After their A/B tests, I could assume that they are leaving the sell of "why" up to the users. This allows the designers to focus on conversions.
Lastly, the four steps aren't traditional "checkout" steps. Each step focuses on very specific information, eliminating clutter and keeping the user's attention. Too many elements on one page can be a bad thing.
If you split it up it looks like less, and by the time the user realises that step 3 has 10 fields they've already progressed through two pages and feel "invested".
Big forms are scary. No one likes forms.
Maybe you got something to say.
Can't you Constrain your Cunt?!
After its all, just A-O-K.
I suppose that's kind of staid. If I send a message back on the tyson rocket it would be, "beat your children now! While there's still time!"
Even though there are technically more steps, they are unambiguous, digestible and feature a clear sense of progression. User usually don't mind multiple steps as long as they make sense within the context of the goal at hand.