As a rule, presidential campaigns with a lot of turnover aren't firing on all cylinders.

Jim Martin, who for months had served as Sen. John McCain's New Hampshire state director, has left the campaign "effective immediately," according to an email sent to campaign staffers from Rob Jesmer, McCain's National Political Director, [Friday] afternoon.

Asked why Martin was departing, McCain communications director Brian Jones said that, "in order for the campaign to be successful in the state we thought it was necessary to move in a different direction."

This comes less than a week after Michael P. Dennehy, McCain's national political director, stepped down from his job, saying he wants to spend more time with his family. For that matter, in late April, McCain replaced his longtime finance director and one of his liaisons to the religious right movement.

I can only imagine what the campaign's internal polls are saying right now.

There's more on this and other campaign-related stories in the Election Central Saturday Roundup.