Hillary is spending heavily on TV ads in California... I am not sure why she is doing so, if California is so heavily liberal...
Hillary is spending on TeeVee ads in California because her crooked advisors make money via graft on these very very expensive ads.
BTW - the ads are actually helping Trump, they are counterproductive for Hillary
I suspect that when a candidate--especially a Democratic candidate--says they're spending money in a particular state, some of that money is "slush." It doesn't go specifically to a TV or radio ad; instead, it goes to consultants, advisers, precinct heads and other party capos. Those people then "spread the money around" as payment for their support.
Hillary knows a presidential contest requires a little quid pro quo. She's not just buying "air time."
It's rather sickening to see how and what campaign funds are really used for--if a business did this, they'd be targeted for RICO violations.