PHILADELPHIA — Former President Donald Trump endorsed Mehmet Oz in Pennsylvania’s crucial Senate race Saturday night, throwing the power of the most popular figure in Republican politics behind the celebrity surgeon. “This is all about winning elections in order to stop the Radical Left maniacs from destroying our Country,” Trump said in a statement. “The Great Commonwealth of Pennsylvania has a tremendous opportunity to Save America by electing the brilliant and well-known Dr. Mehmet Oz for the United States Senate. I have known Dr. Oz for many years, as have many others, even if only through…