Often, these new movements tend to be radical, anti-systemic, and are inclined to reject the old political and economic order.

CENTERFORSECURITYPOLICY: Latin America's radical grassroots

These presidents need to be the spokesmen for the faithful, and when the faithful begin to divide up, when the faithful reject the president's rendition of the faith, these presidencies tend to collapse very quickly.

NPR: Professor: Bush Is an 'Orthodox Innovator'