It all boils down to the electoral college, DtG. Political strategists are more concerned with the micro-elections (individual states) than they are with the macro-election (the popular vote in the country as a whole). Because it's the cumulative number of micro-elections a candidate for president wins that will determine the outcome. If there are significant numbers of a particular group that can be appealed to as a group (for instance, people of Cuban descent in a state like Florida) within any given micro-election, political strategists might pay close attention to that group. However, as we see in this thread, it isn't always easy to appeal to Jews as a group, because they are no more homogeneous in their opinions than any of the other religions in the US, with the possible exception of fundamentalist Christians.