Democratic Assembly Minority Leader Peter Barca says Tuesday's ruling is "an important step toward reversing the Republicans' anti-democracy agenda and upholding Wisconsin's proud tradition of high voter turnout."
Senate Democratic Minority Leader Chris Larson says "our freedom to vote has been defended" with the ruling by U.S. District Judge Lynn Adelman.
Republican Attorney General J.B. Van Hollen says he will appeal the decision.
And Republican Sen. Mary Lazich, chairwoman of the Senate Elections Committee, decried the ruling as "judicial activism."
Adelman said in his ruling there was no evidence of voter impersonation in Wisconsin, and a person would have to be "insane" to try it because of the difficulty and tough penalties.