The race is currently too close to call with a 3,000 vote difference. Currently Doug Ose is leading 51 to 48 percent against incumbent Congressman Ami Bera.
The Center for Responsive Politics said the 7th District race was the most expensive congressional campaign in the country.
The Center says at least $20 million was spent - two thirds from outside groups.
Democratic incumbent Ami Bera says campaign spending reform is needed.
“If I could do one thing I'd overturn Citizens United, which would get all of this money out of these races and which would make it a little more about the candidates," said Bera.
Citizens United refers to a U.S. Supreme Court ruling that allows unlimited campaign spending by political organizations, associations or unions.
Republican Doug Ose didn't comment about the outside campaign money.
"I don't know whether the numbers are accurate or not, I know that I raised a huge amount of money in this district from people who are interested in seeing a change in the direction of this country," said Ose.
Cassandra Pye, a Republican media consultant in Sacramento, said the 7th District race is one that neither party should be proud of
"Because we never, ever talked in the Ose-Bera race about things that people really, really cared about," Pye said.
Congressman Ose said the country is "not in good shape" and that the voters in the 7th District agreed with him.