The Latest on the 2020 presidential campaign (all times local):

9:40 p.m.

The campaign of Democratic presidential candidate Tom Steyer says it has reached a tentative deal to unionize just ahead of the Nevada caucuses.

Democratic presidential candidate Former Vice President Joe Biden takes a selfie at the Clark County Democratic Party 'Kick-Off to Caucus 2020' event, Saturday, Feb. 15, 2020, in Las Vegas. (AP PhotoJohn Locher)

Democratic presidential candidate Former Vice President Joe Biden takes a selfie at the Clark County Democratic Party 'Kick-Off to Caucus 2020' event, Saturday, Feb. 15, 2020, in Las Vegas. (AP PhotoJohn Locher)

The California billionaire climate activist’s campaign announced Friday it had reached an agreement with the International Brotherhood of Electrical Workers Local 2325. Steyer’s campaign says a majority of field staff agreed to be represented by IBEW Local 2325, and the negotiated agreement will be subject to ratification by campaign staff.

Labor support for candidates is expected to play a critical role in Saturday’s Nevada caucuses, and lobbying for union backing has been spirited.

Staffs of several Democratic campaigns have unionized as the field lobbies to garner labor support ahead of the eventual nominee’s general election matchup with President Donald Trump.

Fans cheer as Democratic presidential candidate U.S. Sen. Bernie Sanders, I-Vt., holds a rally at the Mesquite Arena, Friday, Feb. 14, 2020, in Mesquite, Texas. (Juan FigueroaThe Dallas Morning News via AP)

Fans cheer as Democratic presidential candidate U.S. Sen. Bernie Sanders, I-Vt., holds a rally at the Mesquite Arena, Friday, Feb. 14, 2020, in Mesquite, Texas. (Juan FigueroaThe Dallas Morning News via AP)

Other campaigns that have organized include Sens. Bernie Sanders and Elizabeth Warren, former Vice President Joe Biden and former South Bend, Indiana, Mayor Pete Buttigieg.

Democratic caucus-goers wait more than an hour in line in an early caucus ballot precinct site at an AFL-CIO union office in Henderson, Nev., Saturday, Feb. 15, 2020. Voters filled out ballots with first, second and third choice picks, to be tallied Saturday, Feb. 22, in the Nevada Democratic Party caucus. (AP Photo by Ken Ritter)

Democratic caucus-goers wait more than an hour in line in an early caucus ballot precinct site at an AFL-CIO union office in Henderson, Nev., Saturday, Feb. 15, 2020. Voters filled out ballots with first, second and third choice picks, to be tallied Saturday, Feb. 22, in the Nevada Democratic Party caucus. (AP Photo by Ken Ritter)

 Democratic caucus-goers wait more than an hour in line in an early caucus ballot precinct site at an AFL-CIO union office in Henderson, Nev., Saturday, Feb. 15, 2020. Voters filled out ballots with first, second and third choice picks, to be tallied Saturday, Feb. 22, in the Nevada Democratic Party caucus. (AP Photo by Ken Ritter)

Democratic caucus-goers wait more than an hour in line in an early caucus ballot precinct site at an AFL-CIO union office in Henderson, Nev., Saturday, Feb. 15, 2020. Voters filled out ballots with first, second and third choice picks, to be tallied Saturday, Feb. 22, in the Nevada Democratic Party caucus. (AP Photo by Ken Ritter)