Do you mean in a Republican primary against other Republicans, or against Democrats?
As an environmentalist and animal lover, while I observe Christie is not a batshit crazy fascist like Trump or DeSantis, and is clearly much less horrible than them, I wouldn’t vote for Christie because of things like (to quote Wikipedia):
* “On May 26, 2011, Christie announced he would pull the state out of Regional Greenhouse Gas Initiative.[127] This was challenged in court which ruled in March 2014 that Christie had acted illegally in doing so since state regulations do not permit it.[128] His administration sought to repeal the rules.[129]”
* “Christie has rejected permanent bans on hydraulic fracturing (fracking) in New Jersey and vetoed measures that would ban the process and disposal of hydraulic fracturing waste in the State.”
* “Christie’s settled a lawsuit with Exxon Mobil by allowing the corporation to pay $225 million in damages for environmental contamination at two sites, less than 3% of the $8.9 billion that the state’s lawyers had sought, and extended the compensation to cover other damages not named in the original lawsuit.[131] The settlement was slammed by environmental advocates. David Pringle, state campaign director of Clean Water Action, called it “the biggest corporate subsidy in state history,” vowing to overturn it.[132]”
* “In June 2013, Christie vetoed S1921, an animal welfare bill introduced by the Humane Society of the United States to prohibit the use of gestation crates on pregnant pigs in the state. The bill had passed in the General Assembly with a vote of 60–5 and the Senate 29–4.[137][138][139] A 2013 survey by Mason-Dixon Polling & Research Inc. showed 91% of New Jersey voters supported the legislation.[140] An attempt to override the veto did not come to a vote.[141] In October 2014, a similar bill banning gestation crates, S998, was proposed with a vote in the Senate of 32–1 and in the Assembly of 53–13 (with 9 abstentions).[142][143] While campaigning in Iowa in November, in a conversation with the former president of the Iowa Pork Producers Association, Christie indicated he would veto the bill.[144] He did so on November 27, 2014.[145] The bill’s sponsor, Senator Raymond Lesniak, had vowed to override it.[146]”
And since I support civil rights and LGBTQ people’s rights, I wouldn’t vote for him because he’s acted against same-sex marriages and has tried to fight such law both by veto and by trying to challenge the state Supreme Court.
As a pro-choice person, I wouldn’t support him since he’s anti-abortion and has vetoed funding for Planned Parenthood five times as governor.
He’s set records for unpopularity as Governor of New Jersey: “In June 2017, Quinnipiac found that 15 percent approved of Christie, and 81 percent disapproved. This was the lowest recorded approval rating of a New Jersey governor in history,[232] and the lowest approval rating found for any U.S. governor since Frank Murkowski of Alaska, who registered a 14 percent approval rating in 2006.[233] In a response, Christie said he didn’t care about approval ratings because he was not running for office.[234]”