Given Barr's screwy reversals and non-conservative positions (anti-life, etc.) I would just suggest writing in Chuck Baldwin's name. You can do that in any election whether or not he is on the ballot. I live in Illinois, and I'm glad to hear that many people at my church and hopefully across the state appreciate the point that it is literally worthless for us to vote for McCain. So we hope that by voting for Baldwin we'll make a point to the Republican party and their slide into me-too socialism.
That’s right, we have to send the national republicans and the Illinois Republican Party a strong message. The more people vote for Baldwin in states that Obama or McCain are going to win anyway the better.
Also since you live in Illinois spread the word for people to vote for Constitution Party Senate Candidate Chad Koppie http://www.compustuff.org/koppieforsenate/Bio/aboutchadkoppie.htm