The two are scheduled to debate Friday.
Misty Snow is the first transgender nominee for a major party to run for a U.S. Senate seat.
Darryl Glenn said he is willing to give Trump another chance.
Pat Toomey says he has "serious reservations" about Trump.
Marco Rubio leads his Democratic challenger by 7 points in a new poll.
Trump's behavior "makes it impossible to continue to offer even conditional support for his candidacy," McCain said.
The Loras College Poll is a sharp break from months of polling showing Feingold up.
The Senate leader asked a woman to stop recording a speech he gave in Kentucky.
Johnson is pledging to make his next term his last if he wins a tough reelection race in November.
Republicans are painting Bayh as a Washington insider in the Indiana Senate race.