In the latest clashes in the once-booming oil exporter, riot police in Caracas fired tear gas at stone-throwing demonstrators -- whose leaders vowed not to let up the pressure on Maduro.
"This is a battle of resistance. We will see who gets tired first: us of fighting, or them of repressing," said the deputy speaker of the opposition-majority congress, Freddy Guevara.
The streets of Caracas and several other Venezuelan cities have been the scene of running battles in recent days, with police deploying water cannons and firing tear gas and rubber bullets at demonstrators, who hurled rocks and Molotov cocktails.
Maduro is fighting efforts to force him from power over an economic crisis marked by severe shortages and the world's highest inflation.
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His popularity, already pummeled by the three-year recession, sank further last week when he and his allies sought to tighten their grip with two Supreme Court rulings that stripped the legislature's power.
The court later reversed the rulings amid an outcry.
But the crisis only deepened Friday when authorities banned senior opposition figure Henrique Capriles from holding public office.
That blocks Capriles, who narrowly lost the 2013 presidential election to Maduro, from running against him next year.
The opposition's demands include that authorities set a date for gubernatorial elections that have been postponed indefinitely.
Maduro said yesterday he was "eager" for the elections to go ahead so he could "hand a defeat to those people...So that they will stop the rioting and violence."
Guevara called the president a "liar."
"He knows he would lose" any election, the senior opposition lawmaker told AFP.
Protester Alejandro Navas, a law student, said he was in the streets to demand elections at every level, including presidential.