(New Hampshire Primary Source is a regular feature of WMUR's political coverage.)MORE BIG NUMBERS FOR HASSAN. Democratic U.S. Sen. Maggie Hassan continued her string of consecutive record-setting fundraising quarters in the final three months of 2021.In totals shared exclusively with WMUR’s New Hampshire Primary Source, Hassan’s campaign committee, Maggie for NH, said it raised $3.1 million in the fourth quarter and entered 2022 with $5.3 million in cash on hand.Hassan’s campaign said the senator raised more than half of the fourth quarter total after Gov. Chris Sununu announced Nov. 9 he will not challenge Hassan and will run for a fourth term as governor instead.The fourth quarter receipts bring to $14.4 million the amount Hassan has raised since the current election cycle began, shortly after the November 2020 election. Hassan announced her bid for a second term in December 2020.With $5.3 million on hand, Hassan’s campaign has spent a campaign-to-date total of about $9.1 million. The campaign’s cash-on-hand total at the end of the third quarter of 2021 was $6.5 million.Even with Sununu deciding not to run, Hassan’s campaign has continued to advertise heavily on television with a total of three ads -- in addition to several digital ads. She is still widely viewed as one of the more vulnerable Democratic incumbents in the Senate up for reelection this year and she is targeted constantly in attacks by Republicans.State Senate President Chuck Morse and Londonderry Town Manager Kevin Smith are the leading Republicans expected to run in the midterm contest, while business magnate Bill Binnie, former U.S. Rep. Frank Guinta and state Commissioner of Education Frank Edelblut also have candidacies under consideration.“Granite Staters are ready to reelect Maggie Hassan so she can keep delivering for New Hampshire, and we are grateful for their strong support,” said Maggie for NH campaign manager Aaron Jacobs.“Over the next 10 months, our campaign will be in every community talking to voters about Senator Hassan’s work to grow New Hampshire’s economy, lower costs for Granite Staters and keep our country safe, secure and free.”The Hassan campaign said the fact that more than half of the fourth quarter receipts came in after Sununu announced his decision not to run for the Senate shows that regardless of the opponent, donors are continuing to strongly support Hassan.There were 5-1/2 weeks between the beginning of the fourth quarter and Sununu’s announcement, and 7-1/2 weeks between the Sununu announcement and the end of the year. But those two extra weeks were in the midst of the holiday season – typically a slow period for political fundraising.The campaign said the $3.1 million quarterly total was the most ever raised by a New Hampshire U.S. Senate candidate in the fourth quarter of the year preceding the election year.During the fourth quarter of 2015, former Republican U.S. Sen. Kelly Ayotte raised $2.1 million, while Hassan herself raised about the same amount.In the most recent cycle, Sen. Jeanne Shaheen raised nearly $2.1 million in the fourth quarter of 2019 before winning reelection in November 2020.Shaheen’s Republican challenger, Corky Messner, had receipts of $2.5 million in the fourth quarter of 2019, with $2 million of that total coming in the form of a loan from Messner to his campaign.Maggie for NH previously set fundraising and cash-on-hand records -- $1.04 million and $2.28 million, respectively -- in the fourth quarter of 2020 and in the first quarter of 2021, when she raised $2.9 million and reported $4.4 million on hand.Hassan reported raising $3.25 million in the second quarter of 2021 and $2.97 million in the third quarter of 2021, which were also record totals.The Hassan campaign has said it has 14 full-time staffers, while the New Hampshire Democratic Party’s coordinated campaign, dubbed OrganizeNH, has 17 staffers to help with grassroots organizing for Hassan and other Democratic candidates.Hassan’s campaign has so far aired ads promoting Hassan on a wide range of issues with the underlying theme that she has worked on a bipartisan basis whenever possible – a theme Republicans sharply dispute while charging that she has been a loyal follower of U.S. Senate Majority Leader Chuck Schumer and President Joe Biden.While Republicans have relentlessly attacked, Hassan has been the beneficiary of positive television ads by voting rights and environmental groups.She has been endorsed by Planned Parenthood Action Fund for her position strongly in favor of abortion rights, by the Giffords PAC for her support for additional “commonsense” gun control laws and by End Citizens United/Let America Vote for her position in favor of voting rights.Three weeks ago, Hassan announced her support for a “carve-out” for two voting bills from the current Senate rule requiring 60 votes to end a filibuster to allow legislation to move forward. Hassan said she supports allowing the Democratic-backed Freedom to Vote Act and the John Lewis Voting Rights Act advance on simple majority votes.Hassan’s campaign says she “notched a number of significant wins for New Hampshire” during the past three months.The campaign says she was deeply involved in negotiations on the more than $1 trillion infrastructure deal. It cites her leadership on a bill that ended “surprise” medical billing.It has also pointed out that she has been cited as one of the most bipartisan senators by the Lugar Center and the McCourt School of Public Policy at Georgetown University.