Last week, Tom Tancredo signaled he was ready to exit from the national spotlight since others were taking up his cause of fighting against the creation of a lawful, permanent presence for the undocumented among us. I was skeptical [2]. This week, he's ready to step into the ring [3] against Senator John McCain in the presidential primaries.

"If there are candidates who are diametrically opposed to what we're trying to accomplish here, and if there's anything I can do to retard their progress, I will do so," he told The Associated Press, acknowledging that McCain meets that description.

The possibilities are intriguing. Here's one: Tancredo takes votes from McCain and the Republican candidate ends up being a pro-choice, non-xenophobic, non-homophobic fiscal conservative who favors a troop pullout now. Is there such a candidate?