Tom Kean Jr.’s political roots date to 1776. Is that enough to protect the Republican’s House seat?

LEBANON, N.J. (AP) — Tom Kean Jr.’s political pedigree dates to 1776, when one of his ancestors became New Jersey’s first leader after the United States declared independence. His great grandfather was a senator, his grandfather was a congressman and his father was a governor.

But the family lineage may not be enough to protect Kean in this year’s midterm elections. The Republican congressman is among his party’s most endangered members as Democrats try to capitalize on President Donald...