Looks like bio-tech executive John Crowley isn’t running after all.

After listening to requests over the last few days from Senator John McCain of Arizona and other prominent Republicans, John F. Crowley, a biotechnology executive from Princeton, N.J., announced Sunday that he would not enter the New Jersey Republican primary for United States Senate.

“John is not going to run for the U.S. Senate this year,” said Bill Spadea, a spokesman for Mr. Crowley, who turns 41 on Monday. “Did I anticipate that he was looking more and more like a candidate than not? Sure. He was deeply affected by the outpouring of support. But the bottom line is, he has a tremendous level of responsibility to his family, his company and the Navy.” Mr. Crowley is in the Naval reserve.

Republicans had been enthusiastic about a Crowley candidacy, partly because he is a wealthy executive with a compelling past. He was an executive at Bristol Myers Squibb, the pharmaceutical company, when he learned that two of his children had a rare muscular disorder. He left Bristol Myers, started his own biomedical company to search for a cure, then sold that company for $130 million in 2001 to a company that later developed a treatment for the disorder.

Their loss is our gain, New Jersey’s Senate race moves from possible dark-horse back to Safe Dem.

(corrected the typo)