Although her suburban Atlanta district is mostly black, Ms. McKinney has a sizable Jewish constituency, and Jewish voters here are alarmed by her support for Arab and Muslim causes.

And some Democratic lawmakers with large Catholic or Orthodox Jewish constituencies may also have difficulty embracing the idea.

"It would appear to me that the Democratic leadership thinks that the minority caucus is much more powerful than the Jewish constituency," she said.

Last week, Democrats suffered an upset, losing a New York congressional election to the Republicans in a heavily Jewish constituency.

For Mr. Pascrell, who represents a large Jewish constituency as well as Arab-Americans, there is more than one truth.

Most of its Jewish constituency long ago left the surrounding neighborhoods on Chicago's South Side; 73 percent of current patients are blacks.

JACPAC support often goes to candidates with few Jewish constituents in the belief that their votes count just as much as the votes from heavily Jewish constituencies.

Lewis hails from a primarily Jewish constituency and, according to officials, took this trip to learn more about the Syrian and Lebanese perspective on regional issues.

(C/NF) Lewis represents Bury South, just outside of Manchester, which is a predominantly Jewish constituency.

For decades New York City politics was defined by competition between candidates identified with Jewish constituencies and others identified with white Catholic voters.