For those interested in political parties & electoral systems around the world, the Comparative Study of Electoral Systems (CSES) recently released its CSES Module 2 (2001-2006) data set to the public (Module 1 includes 1996-2001). Bolivia is not included in the data set, but there are several Latin American cases. You need to register to use the data, but registration is free.
CSES is affiliated w/ the ICPSR (Interuniversity Consortium for Political and Social Research), headquartered at the University of Michigan.