Milwaukee Mayor Tom Barrett, Mr. Walker's Democratic challenger, did not win his party's primary until May 8 and has raised only $1 million. Mr. Barrett said Monday he remains "very confident" he will win the recall election. (Associated Press)

Milwaukee Mayor Tom Barrett, Mr. Walker's Democratic challenger, did not win his party's primary until May 8 and has raised only $1 million. Mr. Barrett said Monday he remains "very confident" he will win the recall election. (Associated Press)