Democrats also appear to be taking a handful of additional seats in the state House.
Results from Tuesday's general election will shrink Republicans' big majority in the Arizona Senate.
Several Republicans won races in battleground districts, but enough Democrats won in others to give their party 13 of the Senate's 30 seats, up from only nine now.
That shrinks the Republican current majority of 21 seats to 17.
Winners in key Senate races include Republicans John McComish and Chester Crandell as well as Democrats Ed Ableser, David Bradley, Barbara McGuire and Steve Farley.
Democrats also appear to be taking a handful of additional seats in the state House.
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