(posted Nov. 24, 11:45 a.m.) - Former presidential candidate Fabio Gadea’s opposition leadership will be put to test Dec. 3 in a nationwide march in Managua against election fraud.

Gadea’s political movement is mobilizing 1,800 buses in an effort to bring tens of thousands of supporters to Managua to march under the banner “Against Electoral Fraud and for Free Elections.”

“We are expecting between 70,000 and 80,000 people on the day of the march,” Eliseo Núñez, Gadea’s former campaign boss, told The Nicaragua Dispatch.

The march, expected to start at 3 p.m. on Dec. 3, will be the first massive mobilization of the opposition since the Nov. 6 general elections. Gadea still refuses to recognize the elections or President Daniel Ortega’s victory.

In addition to testing Gadea’s political leadership, the march will also test the ruling party’s tolerance. The National Police have not yet said whether they will allow the march.

The Sandinistas, as usual, are expected to convoke a countermarch or attempt to block the nationwide mobilization with roadblocks—a tactic they have employed in past weeks.

Either way, getting around Nicaragua on Dec. 3 will most likely be difficult if not impossible.