Liebs and Grahamnesty leave Vets group...because the group attacked Obama?

It must be fun to be a Senator and put what's best for your fellow Senator before what is best for the country. Anyways. The other day, Vets for Freedom issued the following ad, asking Sen. Obama why he will meet with Iran, but not with Gen. Petraeus:



In response, Sens. Joe Lieberman and Lindsey Graham promptly stepped down from their positions on the group:

Senators Joseph I. Lieberman and Lindsey Graham, prominent surrogates for Senator John McCain’s presidential campaign, stepped down Wednesday from their positions with an independent group that released a pair of Internet advertisements attacking Senator Barack Obama on Iraq.

Mr. Lieberman, independent of Connecticut, and Mr. Graham, Republican of South Carolina, were both on the policy advisory board to the organization, Vets for Freedom, which on Wednesday released its second Web advertisement in less than a week attacking Mr. Obama.

[...]

After inquiries from reporters, the senators released a joint letter to Vets for Freedom on Wednesday saying they had requested a leave from their positions to come into compliance with the new policy.

“This is obviously something we’re working through,” said Brian Rogers, a spokesman for the McCain campaign. “This is the kind of thing that happens when you have the strictest possible policy on these issues.”

The new policy was meant to head off embarrassing questions about connections of members of the McCain campaign to special interests that run counter to Mr. McCain’s reformist reputation. But adhering to that standard has proved complicated.

So anyways, we're screwed in 2008. Especially if McCain's campaign is going to be that insane.

Exit question: Why did Sen. Lieberman have to step down from his position at Vets for Freedom, but not have to cancel a speaking engagement at a conference held by Rev. John Hagee?