When appointing SC justices? That's my main concern.
IIRC, the President doesn't appoint justices, he nominates them, with the advice and consent of the Senate. What kind of justices do you think McCain will nominate? He'll "reach out" to the Democrats to find "consensus" candidates, folks that the Senate Judiciary Committee would find acceptable. Oh, and of course, they'd have to pass a "Global Warming/Kyoto Protocol" litmus test. Who would be on McCain's short list? Hmmmm. I can think of a few!