Comment: Now you got me confused. ;-)

You said in OP that it is a non-profit group.

You also said you are active in supporting local races and politicians.

If you want to support politicians, then I think the Super PAC is the best way to go. Here is a quote from Wiki on it:

"Super PACs, officially known as "independent-expenditure only committees," may not make contributions to candidate campaigns or parties, but may engage in unlimited political spending independently of the campaigns. Unlike traditional PACs, they can raise funds from individuals, corporations, unions and other groups, without any legal limit on donation size."

http://en.wikipedia.org/wiki/Super_PACs#Super_PACs

You can't give money directly to a candidate, but who cares? Just do the advertising or other activities that the candidate would do with the money you gave them, and YOU get to control it.

Getting further into PAC's, that same web page above that quote talks about connected vs. non-connected PAC's. You would be looking to do a connected PAC, as explained:

"Most of the 4,600 active, registered PACs are "connected PACs" established by businesses, labor unions, trade groups, or health organizations. These PACs receive and raise money from a "restricted class," generally consisting of managers and shareholders in the case of a corporation and members in the case of a union or other interest group."

So, if you set up a regular corporation as your main entity, then only the officers, directors, and stockholders can contribute to the PAC. Same goes for an LLC -- only members (owners) and managers could contribute.

On the other hand, if you set up a "trade group" or other social organization, such as a 501c(4), which is a non-profit organization, then all the members (even if one becomes a member for a $1 donation) could contribute.

Your options are MUCH wider with such a setup. And, in fact, that is exactly why so many big names out there in politics are doing it this way.

Karl Rove's Crossroads. In reality, it is Crossroads GPS, a 501c(4) non-profit corporation combined with American Crossroads, a Super PAC:
http://en.wikipedia.org/wiki/American_Crossroads

Likewise, on the Democrat side, Priorities USA is a 501c4 organization that also has a Super PAC, Priorities USA Action:
http://www.prioritiesusa.org/about

This is how it is done by the big boys. They are the ones who make the legislation (and file the court cases to get the decisions they want), so it is probably the best way to do it.

Unless I am misunderstanding what you want to do.