Republicans cheered on the win, with GOP presidential hopeful Mitt Romney calling it "a signal" of conservative support.
After congratulating Walker, former Alaska Gov. Sarah Palin used the election to blast union leadership for what she called a misguided effort to trick members into supporting big government.
"Perhaps it's those union leaders that need to be recalled and replaced," Palin told Fox News' Greta Van Susteren. "Wisconsin voters are sick and tired of the division that has been called by the radical left."
Below, a round-up of other reactions to Walker's recall win: