Barack Obama’s re-election campaign is once again pushing the tech envelope in politics by embracing Square’s mobile payment service, as my colleague Ryan Kim documents here. That’s a huge boost for Square, of course, and will enable staffers in the field to quickly and easily take credit card payments from supporters. But it’s really a pretty small step in the much broader world of mobile donations, which is a very promising space in politics in the coming years. The ability to accept donations over smartphones as voters attend a campaign event, say, or just lie on the couch could go a long way toward boosting overall donations. You’ll begin to see those solutions emerge both on the mobile Web and in applications very quickly — perhaps as quickly as later this year.