Two Hoosiers have been among the four most bipartisan U.S. senators since 1993, according to the latest rankings by the Lugar Center and Georgetown University's McCourt School of Public Policy.
Former Democratic senator Joe Donnelly ranks third for lifetime score, and Republican Sen. Todd Young ranks fourth.
The Lugar/McCourt Bipartisan Index rates senators through the 2017-18 term of Congress based on bill sponsorships and co-sponsorships. The rankings do not include Republican Indiana Sen. Mike Braun, who took office this year after defeating Donnelly in last November's general election.
The top lifetime score belongs to former Republican senator Lincoln Chafee of Rhode Island. In second place is Republican Sen. Susan Collins of Maine.
The Bipartisan Index ranked 250 senators who have served for at least 10 months between 1993 and this year. In last place is former Republican senator Jim DeMint of South Carolina.
The index measures how often a senator co-sponsors a bill introduced by the opposite party and how often a senator's bills attract co-sponsors from the opposite party.
Rankings for former Indiana senators include Republican Richard Lugar, 29th; Democrat Evan Bayh, 75th; and Republican Dan Coats, 237th. Lugar founded the nonprofit Lugar Center, a global issues think tank, and led it until his April 28 death.
Former senator and ex-vice president Joe Biden of Delaware, the polling front-runner among two-dozen contenders for the 2020 Democratic presidential nomination, ranks 47th in the Bipartisan Index.
Rankings among current senators seeking the Democratic nomination for president include Amy Klobuchar of Minnesota, 78th; Michael Bennet of Colorado, 143rd; Elizabeth Warren of Massachusetts, 195th; Cory Booker of New Jersey, 214th; Kirsten Gillibrand of New York, 234th; Kamala Harris of California, 246th; and Bernie Sanders of Vermont, 247th.