He did in 1980. But for the usual reason: Israel. The Carter admistration had signed on to a U.N. resolution unfavorable to Israel.
Reagan only received 30% of the Jewish vote in 1984 after he allowed the sale of AWACS to Saudi Arabia. Never mind that the deal was important in helping bust the Soviets (AWACS for more oil=low world prices=USSR military complex starved for $$$). Reagan was working to free hundreds of thousands of Jews from oppression in the USSR. But that wasn't enough. He made one decision on Israel which was not popular with Jews and they withdrew support.
Eisenhower received 40% of the Jewish vote in 1956. But then along came Suez. Support for the GOP dropped to under 20% in 1960.
I wish a change were occurring. But I don't see it. I see history repeating itself. One wrong word or move on Israel and the "new" Jewish support Bush has now will turn into fundraising efforts to defeat him in 2004.