From Newsweek:

For 25 years, Tom Rath has been the Bush family’s New Hampshire go-to guy: an affable lawyer, member of the Republican National Committee—and prize catch for any would-be contender in the GOP’s next presidential race. It was no surprise, then, that when George W. Bush’s political team wanted to send ambitious Republican senators a firm message about Harriet Miers (crude summary: “Lay off her if you ever want our help”), they chose Rath to deliver it.

From Tom Rath’s website: “He actively assisted in the U.S. Senate process that confirmed David Souter as Supreme Court Justice.”