Jimmy Carter is certainly wrong that President Bush is anywhere near the worst president of all time. But now he is probably the most unpopular. Kaus explains how he used the immigration semi-amnesty compromise (including an amnesty for back taxes!) to decimate most of his few remaining pockets of support. As Joe observes below, there’s no position more unpopular now than McCain’s combination of stay-the-course toughness in Iraq and softness on immigration. Note that I’m not talking about the merits of either position, and I have some admiration for the senator’s and the president’s courage. My thoughts are only about the effects on Republican chances in 2008.