Almost as soon as the Republican primary ends here Tuesday, Sen. John McCain (Ariz.) will ditch his trademark town hall meetings and begin an aerial trek from one media market to the next, touching down long enough to hold tarmac rallies before moving on.
It is exactly the kind of campaigning that McCain dislikes and has largely been able to avoid. But a campaign of comfort zones will quickly give way to one of time zones after Tuesday, with just a week to go before what could be a decisive day of contests on Feb. 5. That is when Republicans in 21 states, including New York and California, will go to the polls.

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