If a reference is so weak that they will go after the same job from a reference check or decide not to give you references in the future, you should know better

If a reference is so weak that they will go after the same job from a reference check or decide not to give you references in the future, you should know better and find someone else. Each reference should enthusiastically endorse you and want you to succeed. That often means providing several responses, because you are going to go get competitive offers right?