Red-state Senate Democrats, so far holding the line against Supreme Court nominee Brett Kavanaugh, are expected to wait on centrist Republican Sens. Susan Collins Susan Margaret CollinsClub for Growth to spend million in ads for Trump Supreme Court nominee Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (Maine) and Lisa Murkowski Lisa Ann MurkowskiClub for Growth to spend million in ads for Trump Supreme Court nominee Pebble Mine CEO resigns over secretly recorded comments about government officials Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election MORE (Alaska) before announcing their own positions.

No Democrat has yet come out in support of Kavanaugh, more than a week after his confirmation hearings wrapped up. Last year, Democratic Sens. Joe Manchin Joseph (Joe) ManchinManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House MORE (W.Va.) and Heidi Heitkamp Mary (Heidi) Kathryn HeitkampHarris faces pivotal moment with Supreme Court battle Centrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents MORE (N.D.) announced their support for President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s first Supreme Court nominee, Neil Gorsuch, one week after his hearings ended.

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The Democratic leadership’s strategy is to keep the pressure on Collins and Murkowski by not letting anyone from their caucus break ranks and support Kavanaugh before the nominee is assured of having enough GOP votes to pass.

Democrats are hoping the swing Republicans may be swayed by a new anonymous allegation of sexual misconduct from Kavanaugh’s high school days that Sen. Dianne Feinstein Dianne Emiel FeinsteinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Democrats shoot down talk of expanding Supreme Court Biden leads Trump by 12 points among Catholic voters: poll MORE (Calif.), the ranking Democrat on the Judiciary Committee, has referred to federal authorities.

Collins held a one-hour phone conversation with Kavanaugh on Friday, but it was scheduled before Feinstein announced the allegation.

The two GOP moderates have split with their conference on major legislation in the past, including casting votes in defense of abortion rights and ObamaCare, issues that advocates point out could come before Kavanaugh on the high court.

Any Democrat who jumps out ahead of Collins or Murkowski would come under attack from the party’s base. As it is, centrist Democrats have come under criticism for staying neutral.

“It is not an achievement for Democrats to have so far avoided endorsing Brett Kavanaugh. It would be an achievement if they oppose him,” said Brian Fallon, executive director of Demand Justice, a group opposed to the nominee.

Last year, Collins announced her support for Gorsuch on March 28, two days before Manchin declared his backing, followed by Heitkamp and later Democratic Sen. Joe Donnelly Joseph (Joe) Simon DonnellyHarris faces pivotal moment with Supreme Court battle Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (Ind.). Manchin, Heitkamp and Donnelly all face tough reelection races this year in states won by Trump in 2016.

Murkowski praised Gorsuch in glowing terms and signaled she would back him well before his confirmation hearing.

Manchin says he is waiting for a second meeting with Kavanaugh before making up his mind on how to vote, and Heitkamp and Donnelly say they are still making up their minds.

“I closely watched Judge Kavanaugh’s hearing in front of the Senate Judiciary Committee which answered some questions and also raised others. I continue to review his available record, will review the additional documents that continue to be released, and talk with North Dakotans as I continue my evaluation process,” Heitkamp said in a statement.

Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (D-Mont.), who also faces an election in a state Trump carried by double digits, said he’s waiting to meet with Kavanaugh in person before announcing his vote.

“We haven’t got our in-person yet. We’re still trying to get that scheduled and I’ll make a decision after that,” Tester said Thursday.

Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.) stayed in Washington an extra day after the Senate adjourned on Wednesday evening so she could review “committee confidential” documents related to Kavanaugh that haven’t been made public.

She hasn’t made up her mind yet, either.

Republicans control 51 Senate seats and would have enough votes to confirm Kavanaugh without Democratic support as long as no more than one member of their conference defects. Vice President Pence would break a 50-50 tie.

Centrist Democrats have shared the frustrations voiced by liberal colleagues on the committee who have complained that much of Kavanaugh’s record serving in the White House counsel’s office under former President George W. Bush was unfairly shielded from public scrutiny.

Hundreds of thousands of pages of records were labeled committee confidential before the hearing began, and further documents from his time as White House staff secretary haven’t been released to the panel at all.

But aside from the squabbling over procedural questions, a senior Democratic aide acknowledged last week that Democrats on the panel “didn’t lay a glove” on Kavanaugh during the hearings.

Like Gorsuch before him, Kavanaugh declined to reveal his views on hot-button topics such as abortion rights, acknowledging only that Roe v. Wade, the landmark abortion rights case, is an “important precedent.”

Asked Thursday what was the biggest hit Democrats managed to score on Kavanaugh at the hearing, Sen. Sheldon Whitehouse Sheldon WhitehouseFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime House approves legislation making hacking voting systems a federal crime MORE (D-R.I.), a member of the panel who was one of the most effective interrogators, shrugged and declined to answer.

He focused instead on the committee’s process, slamming it as “an unprecedented set of demolitions of the rules and traditions of the Senate.”

“We had real problems getting real answers to questions and we were denied traditionally available documents,” he said.