More personal cash for California governor bid? Whitman won’t say

After spending more than $141 million of her own cash on the California governor's race, GOP nominee Meg Whitman is pointedly refusing to say whether she'll write another check to her campaign.

Polls show Whitman trailing her Democratic opponent, Jerry Brown, with just seven days to go before Election Day. In an interview with ABC's Diane Sawyer, Whitman insisted she's still competitive. And when Sawyer asked Whitman whether she regrets spending so much of her own money, the GOP contender said no.

"Is it possible that at some point, it's just too much money?" Sawyer asked Whitman.

"Well, I think that people need to understand the unions … pour money into politics in this state. They run Sacramento," Whitman replied. "Because I have invested my own money, I don't owe anyone anything. I only owe the voters of California."

Asked whether she'll spend more, Whitman was noncommittal. "We'll see how it goes," she told ABC.

But the San Francisco Chronicle's Carla Marinucci says there are rumors that Whitman could spend in upwards of $18 million on a last-minute "get out the vote" effort in the state. That would surpass what Brown and his Democratic allies, including the unions, have planned for their final push.

On Tuesday, Brown unveiled a new TV ad in the race, using Whitman's own words against her.

The spot begins with footage of an interview with Whitman discussing how hopeful things had been in California when she first moved to the state. "Thirty years ago, anything was possible in this state," Whitman says.

The footage stops, as a message flashes on the screen: "Who was governor 30 years ago? Jerry Brown."

You can watch the ad here:

(Photo of Whitman: Justin Sullivan/Getty Images)