Perry's descent

Some have cited his poor debating skills as a factor; others blame his policy on immigration:

When Republicans were asked in February which issues were most important to them, immigration was seventh on the list, after job creation/economic growth, the deficit, health care, national security/terrorism, energy, and the wars in Afghanistan and Iraq. In this week's poll, immigration had shot up to fourth -- ahead of health care (Mitt Romney's weakest issue), energy and the two wars.

For sure, immigration seems to have become a larger issue than anyone had anticipated. However, I'd generally side with those who think that it's due to his lack of visibility. He just doesn't look, er, presidential enough.

(Image: Associated Press, via Politico)