It's not impossible. According to this article, Tancredo has a lot of support in Iowa. If he can win the caucus there he's going to get more serious money to keep going. And if he can score a win in the New Hamshire primary, he's a much more serious candidate. Don't forget that California moves their primary up to March in the next election. There are many people here sick of the illegal thing. If he can win that one, he's already got a lot of delegates. It's going to be interesting.
At this point, given the alternatives I've seen so far, I would be very tempted and probably would vote for him in our AZ primary (especially against pro-immigration/Kennedy McCain). Electing Tancredo would be the equivalent of sending an earthquake through the Republican Party and sometimes earthquakes can be fun. We still have time to save our Country .... but in three years I'm not certain how much time, if any, we'll have left.