Arizona Sen. John McCain and other like-minded Republican senators could end up reprising roles as key deal-makers as the party seeks a final negotiated solution to the government shutdown. With a core group of House Republicans sticking together in their chamber, and Senate GOP leader Mitch McConnell taking a low public profile in the fight, that leaves McCain and similar-thinking GOP senators to look for a deal. McCain has argued over and over again that this is one battle that the Republicans simply cannot win. And most Republican senators seem to agree with him, but there is little evidence that...