MADISON, Wis. -

Attorney General J.B. Van Hollen said he will appeal a Dane County judge's ruling blocking Wisconsin's new voter identification law.

Republicans passed a bill last year that requires all voters to show photo identification at the polls. The Milwaukee branch of the National Association for the Advancement of Colored People and immigrant rights group Voces de la Frontera sued, arguing the law creates burdens for voters.

Dane County Circuit Judge David Flanagan sided with the groups Tuesday, ruling the law impairs the right to vote.

Van Hollen said in a statement Wednesday he believes the law is constitutional and it isn't burdensome to require voters produce identification.

Another Madison judge has blocked the law in a separate lawsuit filed by the League of Women Voters. Van Hollen is appealing that decision, too.