There are 4 leading candidates. Here's how their past confirmation votes went down.

From CNN's Ted Barrett
July 9, 2018

Amy Coney Barrett was confirmed to her seat on the Seventh Circuit on Oct. 31, 2017, just about 8 months ago.

The vote was 55-43, with Sens. McCaskill and Menendez not voting.

Notable votes:

GOP: Sens. Collins, Murkowski and Paul voted yes.
Democratic: Sens. Donnelly, Kaine and Manchin voted yes.

Raymond Kethledge was confirmed to his seat on the Sixth Circuit on June 24, 2008, about 10 years ago.

He was approved by a voice vote, which means there was unanimous consent to approve him without a recorded roll call vote signaling broad bipartisan support for his confirmation.

Notable:

GOP: Sens. Collins and Murkowski were both in the Senate at that time
Democratic: 20 members of the current Democratic caucus were serving then: Feinstein, Carper, Bill Nelson, Durbin, Cardin, Stabenow, Klobuchar, McCaskill, Tester, Menendez, Schumer, Brown, Wyden, Casey, Reed, Whitehouse, Leahy, Sanders, Cantwell, and Murray.

Thomas Hardiman was confirmed to the Third Circuit on March 15, 2007, about 11 years ago.

The vote was overwhelmingly bipartisan, 95-0, with five senators not present, including Durbin and McCain who are still serving.

Notable votes:

GOP: Sens. Collins and Murkowski voted yes
Democratic: 18 members of the Democratic caucus who are still serving voted for Hardiman. They are: Brown, Cantwell, Cardin, Carper, Casey, Feinstein, Klobuchar, Leahy, McCaskill, Menendez, Murray, Bill Nelson, Sanders, Schumer, Stabenow, Tester, Whitehouse and Wyden

Brett Kavanaugh was confirmed to his position on the Court of Appeals for DC on May 26, 2006, about 12 years ago.

The vote was bipartisan, 57-36, with seven senators not voting, including Thune, who is the only one still serving.

Notable votes:

GOP: Sens. Collins and Murkowski voted yes
Democratic: Four Democrats voted yes, including Sen. Carper who is the only one still serving. (Sens. Byrd, Landrieu and Ben Nelson are the others three.)