The philosophical argument is that Linux really has nothing to do with government. It's free, knows no borders, and the community is highly apolitical. But there's another argument, a practical one. There are some things at stake that matter, or ought to matter, to Linux users and to those to whom Free or Open Source software is important. In fact, like it or not, the community has been shot through with political issues all year.
Money is, of course, one way of vocalizing concerns.
But it's not the only one. Not email, which simply isn't taken as seriously by any candidate as is a physical letter. And not gathering on a message board and complaining or flaming. There's time still to ask questions and to make your opinions known. The window of opportunity is open, the election close, each vote more important than ever before.