Even if support for Obama is down to 55%, most latinos will vote democrat, just as sure as the sun will set in the west tomorrow.
If 51% of the Hispanic vote vote for Obama, and 49% vote against him, that is a net margin for Obama of 2% of the Hispanic vote. The Hispanic vote is about 10% of the national vote, so 2% of 10% is 2/10’s of 1% of the national vote, spread around most of the American people, politically inconsequencial.
To compare, the old 70% support figuring would be: 70% for Obama, 30% against, a net margin of 40$ of the Hispanic Vote. 40% of 10% is 4% of the national vote, this is nearly half as large as the net 8% of the national vote produced by African American Obamaites, and would have been signifigant.
The decline for support for Obama among Jews is less important in terms of votes, but Jews have made a large part of Democrat financial support and support among American elites.
The somewhat less dramatic loss of support for Obama among Catholics is primarily important politically since it brings them into political agreement with evangelical Protestants, and distances them further from high church protestants, who tend to be theologically more in agreement with Catholicism.
The long time prospects are that Hispanics, Jews, and Catholics will become more involved as part of the ‘American’ party, which has been the Republicans since the time of McKinley.