So former mayor Ed Koch has changed his mind after hearing President Obama's speech to the UN General Assembly last week and will back him for reelection after all. Mr. Koch, a DFB, or Democrat From Birth, created quite a stir several weeks ago when he endorsed Republican Bob Turner in the special election in New York's heavily Democratic 9th Congressional District against Democrat David Weprin. Mr. Koch urged voters in the predominantly Jewish district to vote for Mr. Turner as a way of sending a message to President Obama that they opposed his policies regarding Israel - his "open...