The National Republican Congressional Committee has launched another TV ad against Democrat Kate Marshall in the special election for Nevada’s 2nd district.

It’s the NRCC’s fourth ad in advance of the Sept. 13 contest to fill the seat of appointed Sen. Dean Heller (R), with the party committee offering heavy assistance to former state GOP Chairman Mark Amodei’s campaign. The committee dropped $345,000 to air the ad through Aug. 22.

The ad loops a clip of Marshall highlighting her leadership as state treasurer during the economic crisis, while negative phrases flash across the screen.

“I’ve taken the state through this fiscal crisis, steered it with a steady hand,” Marshall says. Meanwhile, the following phrases appear one at a time in the middle of the screen: “Democrat Kate Marshall … Two state credit downgrades … Nevada economy worst in nation.”

It’s the latest in a series of attacks on Marshall’s fiscal record, which she continues to tout. The NRCC is working hard and spending big to keep this seat, which has never been held by a Democrat. The committee continues to highlight her political party as the Marshall campaign plays it down.

Marshall reported a strong start on fundraising, and she’s received more help on that front in recent days from President Bill Clinton and Senate Majority Leader Harry Reid (D-Nev.). That’s keeping the NRCC pushing hard on Amodei’s behalf.

“The only place Kate Marshall steered the Nevada economy is straight off a cliff,” NRCC spokesman Tyler Houlton said in a statement. “While Kate Marshall campaigns on her failed record as the state’s top financial officer, Nevada working families and small businesses suffer from the highest unemployment and home foreclosure rates in America.”

“Just more misleading and false attacks aimed at distracting voters from Mark Amodei’s billion-dollar tax increase package,” Marshall spokesman James Hallinan said in response to the ad. “If the NRCC and Amodei actually read the bond reports, they would know that Kate Marshall’s work as treasurer kept the state in the AA range, and her fiscal management is listed clearly under ‘credit strengths’ in both reports.”