Player of the Week: Sen. Harry Reid (D-Nev.)

President Obama is facing a likely defeat on his Syria authorization request, but the White House is attempting to change the minds of many members.

He has gotten help from Senate Majority Leader Harry ReidHarry Mason ReidNevada journalist: Harry Reid will play 'significant role' in Democratic primary The Hill's Morning Report - Sponsored by AdvaMed - A crucial week on impeachment The Hill's Morning Report — Pelosi makes it official: Trump will be impeached MORE (D-Nev.), who on Monday compared Syria’s use of chemical weapons to actions by the Nazis.

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In his speech on the Senate floor, Reid said he watched videos of the chemical attacks, adding: “I will never get that out of my mind. ... This brutality deserves a response.”

The first vote on Syria is expected to occur in the Senate. The Obama administration hopes passage in the upper chamber will generate momentum in the House, where “no” votes have been piling up.

But getting through the Senate is no sure thing; the Senate Foreign Relations Committee last week approved it by only a 10-7 vote.

Some Democrats, including Sen. Mark PryorMark Lunsford PryorTom Cotton's only Democratic rival quits race in Arkansas Medicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation MORE (Ark.), Heidi HeitkampMary (Heidi) Kathryn HeitkampPro-trade group launches media buy as Trump and Democrats near deal on new NAFTA The Hill's Morning Report — Biden steadies in third debate as top tier remains the same Trump wins 60 percent approval in rural areas of key states MORE (N.D.) and Brian Schatz (Hawaii), have said they oppose American military intervention.

Reid must minimize defections or the Syria initiative will fail in his chamber. Most Republicans will probably vote “no,” and some might support a filibuster.

Reid has been able to unite his caucus in the past, but whipping on a war-related measure is tricky. He has urged his Democratic colleagues to at least vote with the president on torpedoing a filibuster.

It is open to doubt, however, that if they did so, there would also be a majority willing to vote “yes” on the underlying bill, especially as the public is strongly opposed to intervention.

At this point, Reid can only do so much. It is up to the president to change minds, and he is undertaking a media blitz to do so, which will culminate in Tuesday’s address to the nation. After that, Reid will try to win over skeptical members of his caucus.