So would aiding and abetting terrorists to kill US soldiers qualify as behavior unbefitting of a sitting US senator?

On October 12, Scott Swett at the American Thinker reported that Senator Barabara Boxer (D-CA) along with Representatives Raul Grijalva (D-AZ), Dennis Kucinich (D-OH) and Henry Waxman (D-CA) secured diplomatic courtesy letters that allowed anti-American Code Pink activists to travel to the Iraqi border. The radicals traveled to Jordan and the Iraqi border in late 2004 to donate $600,000 worth of humanitarian aid to the people who had just killed 51 Americans and wounded 560 more earlier that month. Operation Phantom Fury in Fallujah was the heaviest US urban combat since the Vietnam War.

After the report was published at American Thinker the article was deleted at Islam Online.
But, thanks to the internet archive a copy of the article is still available:

The article says that Code Pink:

“Secured diplomatic courtesy letters from US Senators Barbara Boxer of California and Raul Grijalva of Arizona and Congressmen Dennis Kucinich of Ohio and Henry Waxman of California.”

Swett reported on how Barbara Boxer and Code Pink assisted terrorists in Iraq:

Perhaps the most revealing window into Boxer’s true feelings towards our military is her close alliance with Code Pink, a radical leftist group that reviles American troops as terrorists and assassins while praising their enemies as freedom fighters. For years, Code Pink has viciously harassed wounded veterans and their families outside Walter Reed Hospital, even telling the mother of a slain Navy Seal that her son “deserved to die.” Code Pink actively supports terror groups such as Hamas, the Muslim Brotherhood, the Taliban, Hezbollah and al Qaeda.

The Code Pink website repeatedly praises “our beloved Barbara Boxer.” And why not? Boxer has worked with the group and supported its goals on many occasions. In early 2005, Boxer was the only member of the Senate to oppose certifying the Electoral College result that returned George Bush to office for a second term. Code Pink hosted rallies and participated in various demonstrations and marches to “defend democracy” against the results of the 2004 elections. They wrapped up the event at Senator Boxer’s California office, “singing her songs of thanks.”

Code Pink’s leaders had just returned from Fallujah, Iraq, where 51 Americans had been killed and 560 wounded in the US Marines’ heaviest urban combat since the Vietnam War.Code Pink delivered $600,000 in cash and supplies to the very insurgents the Marines had been fighting against – quite literally giving aid and comfort to America’s enemies in a time of war. As noted in Islam Online, a diplomatic courtesy letter from Barbara Boxer helped make the trip possible.

On returning home from their trip to Fallujah Code Pink founder Medea Benjamin told reporters:

“I don’t know of any other case in history in which the parents of fallen soldiers collected medicine … for the families of the ‘other side’,”said Medea Benjamin, the founding director of Global Exchange, a human rights group. “It is a reflection of a growing movement in the United States … opposed to the unjust nature of this war,” she said.

This must have made Barbara Boxer very happy.
Unfortunately, our corrupt media will continue to hide this horrible event from the American people.
Hat Tip Opaobie

More… Kristinn added: The 2007 movie Meeting Resistance, which was filmed in Iraq around the same time as Code Pink’s aid to the terrorists in Fallujah, documented how the families of the “other side” in Iraq acted as couriers for the terrorists.