To clarify I meant changing the pledge from:

"to donate 10% of their income to the charities that they believe will most effectively help people living in poverty"

to:

"to donate 10% of their income to the charities that they believe will most effectively help persons living in poverty".

I don't think the usage in this context is referring to the actors with the means and inclination to take altruistic action; the context instead is on those acted upon. (Of course, this is not a very good way of saying it, especially as there is ample evidence that money given directly to the poor in developing countries might be better than developed countries giving what they incorrectly think the poor need, but this is beside the point.)

When conservative people read "persons in poverty", they will automatically think "humans living in poverty", whereas those more familiar with the use of "person" being inclusive with non-humans might instead interpret "persons living in poverty" much more liberally. (I realize this is nonstandard usage of the term, but my intent here is to allow a liberal interpretation while maintaining specificity.)