Los Angeles, California (CNN) - A number of high-profile primary battles highlight races in 12 states Tuesday, including a senator trying to save her political life and a runoff in a special congressional election to fill a vacant House seat.
In California, a large state with pricey television markets, campaigning can be expensive. But that doesn't seem to be a problem for wealthy candidates Meg Whitman and Steve Poizner in the battle for the Republican gubernatorial nomination.
Whitman, the billionaire former eBay CEO who also was an adviser and surrogate for Sen. John McCain's 2008 presidential bid, has spent around $70 million of her own money. Poizner, California's insurance commissioner and a self-made multimillionaire, has injected some $25 million of his money into his campaign.
The most recent polls of likely GOP primary voters indicate that Whitman leads Poizner by around a 2-1 margin. The Republican winner in Tuesday's primary likely will face off in the general election against state Attorney General Jerry Brown, a former two-term governor and the presumptive Democratic nominee.
Listen: CNN's Paul Steinhauser on Tuesday's big races