In the 2012 general election, Oberweis won the 25th State Senate seat previously held by Chris Lauzen, his former GOP primary rival in the 2008 congressional race.
While State Senator he was a member of a group of conservative state senators elected in 1992 who often challenged the leadership of the Illinois Republican Party and were dubbed the "Fab Five", the group also included, Peter Fitzgerald, Dave Syverson, Patrick O'Malley and Chris Lauzen.
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