Two days before early voting is set to begin in a special election for a Nevada House seat, Republican Mark Amodei's campaign is running a new ad featuring Republican Nevada Gov. Brian Sandoval.

"Times like these require principled leadership. That’s why I’m encouraging you to send Mark Amodei to congress," Sandoval says in the ad. "We need fiscal conservatives in Congress like no other time in our history. I know Mark, he’ll cut the debt, fight against higher taxes, and I’m confident he will always do the right thing for Nevada. Early voting begins August 27. Please join me in voting for Mark Amodei."

The governor won every county in the state last fall and remains popular: a recent poll by the Democratic-leaning firm Public Policy Polling had 44 percent of voters approving of the job he was doing, with 38 percent disapproving. Sandoval hails from the district, which covers most of Nevada outside of Las Vegas and its immediate suburbs and leans Republican.

Amodei is in a tough battle with Nevada State Treasurer Kate Marshall. While a poll conducted for the conservative Americans for Prosperity last week had him up by 13 points, a PPP poll released this week had him nearly tied with Marshall, at 43 percent to 42 percent.

Marshall's campaign response focused on Amodei rather than attacking the popular governor. "Governor Sandoval must be talking about the wrong candidate in this ad," said communications director James Hallinan. "Mark Amodei has a reckless financial background of voting himself a pay raise and sponsoring the largest tax increase in Nevada history that included job-killing taxes on businesses. Kate Marshall is the only fiscally responsible candidate in this race making millions for Nevada on her investments every quarter she has been in office, refusing a pay raise and even auditing her own office."

Republicans have been spending heavily to keep hold of the district, which was vacated when Sandoval appointed then-Rep. Dean Heller (R-Nev.) to the Senate. Republicans have held the district for decades, but President Obama came within a hundred votes of winning it in the 2008 presidential race.

The special election takes place on Sept. 13.

Watch the ad here: