Spending on tomorrow's California primary election by outside groups has hit $23 million.  

The Sacramento Bee reports that's the most outside cash poured into a June primary by outside interests since the nearly $26 million spent in spring 2006.

Outside groups have spent more than $4 million in the race for state superintendent of public instruction, more than twice as much as the candidates themselves.  

That's also the case in several other races.  

Republican political consultant Matt Rexroad says "we do lose control" when the candidates are outspent by outside groups, even those that support them.