I can't fund much about the 2013 election, but Jimmy Carter had this to say about 2012:
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"As a matter of fact, of the 92 elections that we've monitored, I would say the election process in Venezuela is the best in the world," Mr. Carter said, noting the center's extensive work monitoring elections around the globe.
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"Comparing average coverage by private and state
media outlets in Figures 1 and 2, we find imbalance
in the tone of coverage among both but find it more
pronounced among state media. On the one hand, in
state-owned television, 95 percent of reporting was
positive about Hugo Chávez, while in private outlets
this number reached 48 percent." (pg34)
"...NGOs monitoring the campaign, such
as Transparencia Venezuela and Grupo La Colina,
have indicated broad use of government resources
to support the Chávez campaign, such as vehicles to transport campaign workers and supporters to marches
and also on voting day." (pg43)
"In the Venezuelan context, safeguards to prevent the
abuses of ventajismo or to make violations of the law costly not just financially but politically, in terms of imposing sanctions against the perpetrating campaign, are crucially missing." (pg43)