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I think you might be underestimating the amount of money in politics that comes from large organized contributors who give money to both parties for purposes of making the system in general beholden to them rather than favoring one ideology over the other.
I think those contributors will probably not be our main demographic, since they have an interest in the system as it is and don't want to risk disrupting it. In theory, though, donating to both parties can be modeled as a costly signal (the implied threat is that if you displease me, the next election I'll only donate to your opponent), and there's no reason you can't do that through our site.