The last time a Republican won a U.S. Senate election in New Jersey, Donald Trump was 26 years old and still a decade from opening a casino in Atlantic City. That was 1972. Fifty-two years later, Republicans believe they have their best chance in a very long time to end the losing streak. They’re hoping the corruption charges against incumbent Sen. Robert Menendez, who isn’t seeking his party’s nomination, will sour voters on any Democratic challenger, or that Menendez might play spoiler by running as an independent. And as with most things political these days, looming large over the June 4 p…