[Lurking Libertarian]

Filing in the Wisconsin Supreme Court is a big mistake. They generally do not hear cases that didn't start in the lower courts. This is not an automatic dismissal (unlike in the federal system, the Wisconsin Supreme Court can hear an original case, but almost never does), but gives them an easy out if they don't want to hear it; they won't have to write an opinion or deal with the merits, they can just say "should have been filed in the Superior Court; dismissed".

[Political Junkie Too]

unlike in the federal system, the Wisconsin Supreme Court can hear an original case

Not true.

Article III Section 2 says:

In all Cases affecting Ambassadors, other public Ministers and Consuls, and those in which a State shall be Party, the supreme Court shall have original Jurisdiction.

Suing a state for running a fraudulent election based on willful disregard for election law duly passed by the legislature could go straight to the Supreme Court to be heard.

-PJ