There isn't one. A scientist (a non-quack one at least) running on the Republican ticket would be wasting his time. The Republican voters do not care for scie

There isn't one. A scientist (a non-quack one at least) running on the Republican ticket would be wasting his time. The Republican voters do not care for science (esp. anything that contradicts their worldview), and insist on anyone they vote for being highly and openly religious. That's not going to work too well for scientists, even if they were fiscally conservative.