Since announcing his candidacy for governor on July 8 last year, former Harvard Pilgrim Health Care CEO Charles Baker has raised almost double what Gov. Deval Patrick has raised since April 25 — the date when Patrick’s first gubernatorial challenger announced.

Since announcing his candidacy for governor on July 8 last year, former Harvard Pilgrim Health Care CEO Charles Baker has raised almost double what Gov. Deval Patrick has raised since April 25 — the date when Patrick’s first gubernatorial challenger announced — according to campaign finance reports filed with the state.

While Patrick’s fundraising efforts have been solid — he’s raised $1.14 million since April 25 — Baker has outpaced him with $2.23 million raised since jumping into the race in July. In a recent press release issued by the Baker-Tisei campaign office, the Baker for Governor and Tisei for Lieutenant Governor campaigns said the candidates “ … raised a combined $1,039,602 in the month of December, surpassing multiple fundraising records in the process.”

Baker’s campaign checking account also holds more cash than Patrick’s, according to the most recent reports filed with the state Office of Campaign and Political Finance (OCPF). Baker had $1.63 million in his account as of Dec. 31, while Patrick had a little more than $667,000.

The other two gubernatorial candidates, state Treasurer Tim Cahill and former convenience store magnate Christy Mihos, lagged behind both Baker and Patrick in fundraising last year.

Cahill, who switched his party affiliation from Democrat to Unenrolled for next year’s election, has raised $496,000 since he announced his candidacy on Sept. 9. He also had $870,000 in his campaign checking account as of Dec. 31, with some funds carried over from his previous runs at elected office.

Jason Tait, OCPF director of communication and public education, said that candidates are only allowed to have one campaign account, but can use funds they previously raised as long as they open a new account and transfer the funds.

So in the case of candidates such as Cahill who have previously run for other offices, they must close out their previous account — in Cahill’s case, his state treasurer account — and transfer those funds to a new account based on whatever office they are currently running for — in this case, governor.

Mihos, who ran for governor as an Unenrolled candidate in 2006 and is currently running as a Republican, has raised $399,000 since he officially announced in late April, although $295,000 of that total comes from Mihos himself, either from direct contributions or loans. His campaign checking account holds $3,085.

The candidates’ running mates have pitched in as well. Baker’s running mate, Sen. Richard Tisei, R-Wakefield, has raised $399,000 since joining the ticket on Nov. 23 and his checking campaign account holds $351,000.

Lt. Gov Tim Murray has raised $465,000 since April 25 and his checking campaign account holds $243,000. Cahill announced last week that former Republican state representative Paul Loscocco — who like Cahill is changing his party affiliation to Unenrolled for next year’s election — will be his running mate. Loscocco had $53,000 in a campaign checking account at the end of 2008, according to the most recent report available from the OCPF.

Mihos does not have a running mate yet, and none is required under state law. Candidates for governor and lieutenant governor run on separate ballots in Massachusetts.

Candidates’ hometown contributions

Each candidate has enjoyed support from neighbors in his respective hometown. Baker has raised $78,000 in Swampscott and Tisei has raised $27,000 in Wakefield, while Patrick has raised $22,715 in Milton and Murray has raised $57,855 in Worcester, where he served as mayor for five years.

In Quincy, Cahill has raised $52,869 since announcing his candidacy, while in Yarmouth, Mihos has raised $302,000, although, again, all but $5,000 of that amount comes from Mihos himself.

Contact Daniel DeMaina at ddemaina@cnc.com.