Updated at 8:30 p.m.: After winding through downtown -- and being denied crossing the Burnside Bridge by Portland police -- the group arrived back at PSU. Chanting "we reject the president elect" and declaring to continue resistance for the next four years, the protest comes to an end.

Updated at 7:45 p.m.: The group has left the square and begun marching again.

Updated at 7:10 p.m.: The demonstrators have arrived at Pioneer Courthouse Square and are no longer blocking traffic. Speakers are again addressing the crowd.

Updated at 6:50 p.m.: Speakers have addressed the crowd, which has swelled to several hundred. The march to Pioneer Courthouse Square has begun, as rain starts falling.

Updated at 5:40 p.m.: Several dozen people have gathered at Portland State University and are waiting for speeches to start. Biketown has tweeted that it has shut down several of its bike-rental stations because of the protests. Find the closed locations here.

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Hundreds of protesters are expected to take to downtown Portland streets Monday night for an "Electoral Justice" march during the evening commute.

Portland's Resistance, the group that led protest marches for days after Donald Trump's presidential victory last month, is organizing the event.

The march comes as the Electoral College meets throughout the nation to formally cast votes in the 2016 election. Oregon's seven electoral college voters have already cast their vote Monday in support of Hillary Clinton, reflecting the popular vote results of election night 2016. Some groups had held out hope of an electoral voter revolt in swing states, handing the presidency to Clinton.

Portland's protest and march will begin at 5:30 p.m. at the South Park Blocks at Portland State University. Cameron Whitten, march organizer, told The Oregonian/OregonLive he expects about 400 people to meet at PSU for some speeches before marching to Pioneer Courthouse Square.

The group expects to hang out at the square until about 7 p.m. before continuing the march.

While they are protesting the Electoral College, Whitten said, "This is a callout for people to look at everything that is going on this country." That includes protesting concerns about Russia hacking the U.S. election, he said.

-- Andrew Theen and Tony Hernandez