(CNN) - The National Republican Senatorial Committee is committing an additional $1.8 million to Carly Fiorina's bid to unseat Democrat Sen. Barbara Boxer, according to two Republican sources.
This will bring the committee to $4.8 million invested which is the total amount allowed by federal election law in a coordinated campaign. The money is being shifted from Florida, where Republican candidate Marco Rubio seems to have solidified a strong lead.
In California, Boxer is consistently polling ahead of Fiorina. But NRSC spokeswoman Amber Marchand tells CNN the committee believes, "thanks to Carly Fiorina's candidacy, this seat represents a very competitive pick-up opportunity for Republicans in November."
National Republicans believe Boxer remains vulnerable in part because her negatives are high and her years in Washington could be a liability in an anti-incumbent year. Says Marchand, "with state unemployment above 12 percent and voters struggling to make ends meet, Californians are tired of millionaire Senator Barbara Boxer's reckless spending agenda and record debt in Washington."
Boxers campaign didn't reply to a request for comment on the NRSC spending, but in an interview with CNN's Wolf Blitzer, Boxer took on Fiorina directly. Repeating one of the central messages of her campaign – that Fiorina supported outsourcing while CEO of Hewlett Packard – she told CNN, "[Fiorina] created jobs in India instead of Indio, California. She created jobs, but not in America. And she said she would do it all over again. And she said there's no God-given right to a job in America anymore. And she doesn't have the heart for these times we are going through."
In the latest CNN/Time/Opinion Research Poll of likely voters, 52 percent of respondents said they would back Boxer and 43 percent said they would back Fiorina. The survey had a sampling error of 2.5 percentage points. But a more recent Reuters poll conducted October 2-5 shows Boxer with just a four-point advantage over Fiorina.