Obama also chided McCain for another new commercial that promises " change that we need . " " Sound familiar ? " said Obama , who has made " change " the central theme of his campaign . " Let me tell you , instead of borrowing my lines he needs to borrow some of my ideas . Change is n't about slogans . It 's about substance . " He also took a little poke at McCain 's running mate , Gov.
According to the above context, choose the best option to answer the following question.
Question: Why would Obama be talking about McCain like that ?
Options:
- None of the above choices .
 - Obama wants to memorialize McCain after his death .
 - They are political rivals .
 - Obama is commending the usages of slogans .


They are political rivals .