WESTFIELD, N.J. (AP) — When New Jersey voters gathered this week to talk with a state lawmaker about affordable housing and new data centers, there was something else on their mind, too. Where is their congressman, Republican Tom Kean Jr.? “What’s the word?” Steve McCabe, an 80-year-old retired lawyer, asked Jon Bramnick, a GOP state senator. Bramnick had no answer for Kean’s unexplained medical absence that has stretched over nearly three months. But he told the audience how Kean hated to miss votes when they served together in the Legislature, even if that meant driving through a snowstorm. “I said, ‘Tom, we should really turn around,’” he recalled. Now Kean has missed more than 100 votes in Congress, and he has not been spotted in Washington or in his district. It is a political mystery with potentially national consequences: Kean represents a district that is among Democrats’ top targets as they try to retake control of Congress. Kean’s office insists he is still running for reelection.…