Decent article on Bolivian elections

It doesn't reveal anything new, but this AP article frames the issues in a pretty clear and straightforward way.
It's worth noting that in the last presidential election, cocalero candidate Evo Morales (Movement Toward Socialism party) wasn't a contender until the U.S. Embassy threatened to withdraw aid to Bolivia if he won the election. The Morales campaign suddenly surged to place a close second behind "our" candidate in a sort of referendum against U.S. meddling.
The current ambassador, David Greenlee, won't publicly pick sides in the current presidential race, a U.S. diplomat I spoke with said.