The measure approved on a 112-41 vote Saturday by the Legislative Assembly will be submitted to voters in a national referendum.The move had been expected since Morales' supporters control the two-thirds of congress needed to adopt constitutional amendments.
Morales is Bolivia's first indigenous president and in last year's election he won his six-year term with 60 percent of the votes. But he has seen support erode some as a result of economic woes caused by the country's dependence on exports of natural gas and minerals, which are fetching lower prices on world markets.
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