Washington (CNN) - National Republicans are dropping more cash into California's close contest for the Senate.
The National Republican Senatorial Committee says it's injecting $3 million in ad spending into California this week on behalf of GOP Senate nominee Carly Fiorina. They say that brings to nearly $8 million the amount the NRSC has spent on behalf of the former Hewlett-Packard CEO.
The ad buy comes as a Los Angeles Times/USC poll indicated that three-term Democratic Sen. Barbara Boxer held a 50 to 42 percent advantage over Fiorina among likely California voters.
Republicans are pushing back on that survey, saying their own internal numbers suggest a closer race. Other recent non-partisan polls over the past few weeks indicated that Boxer held a smaller single digit advantage over Fiorina.
"This critical spending continues to demonstrate our confidence that the California Senate race is neck and neck," says NRSC Press Secretary Amber Marchand.
The Boxer campaign acknowledges that they will be outspent when it comes to ad buys in these closing days leading up the November 2 election if the NRSC does spend another $3 million in the last week of the campaign, alongside ad expenditures by the Fiorina campaign. The Boxer campaign wouldn't reveal their television commercial buys for the last week of the campaign, but they do say they are currently up with ads in ten media markets in the Golden State, as well as putting up commercials in Spanish.
–Follow Paul Steinhauser on Twitter: @psteinhausercnn