MILWAUKEE (AP) -- Wisconsin Gov. Scott Walker has raised more than $25 million to defend his job, drawing heavily from prominent GOP players outside the state and dwarfing the amounts raised by his Democratic challengers.

Other groups are contributing millions more in advertising. And Walker has leading Republicans campaigning for him, including New Jersey Gov. Chris Christie.

The governor's fundraising firepower and his broad support among the GOP elite illustrate the challenge facing his opponents. The Democrats who swarmed the state capitol last year to protest Walker's assault on public unions now have only a month before a historic recall election to counterpunch Republicans who have rallied strongly behind the Wisconsin superstar.