Props to McClatchy for even looking into this:

In speech after speech, in statement after statement, Bush insists that “this is a war in which, if we were to leave before the job is done, the enemy would follow us here.”...

“The president is using a primitive, inarticulate argument that leaves him open to criticism and caricature,” said James Jay Carafano, a homeland security and counterterrorism expert for the Heritage Foundation, a conservative policy organization.

The function of the meme is to connect a war in a faraway land to the "homeland", making it necessary to domestic safety. As messaging it accomplishes this goal.

But as far as logic and reality, it makes no damn sense whatsover. It never has.

Today's SF Chronicle:

President Bush in his State of the Union address Tuesday warned that an early U.S. exit would create "a nightmare scenario" for America.
...
Not everyone is convinced. Some analysts say the apocalyptic scenarios of U.S. withdrawal mirror arguments the administration and many others made for the U.S. invasion in 2003.

Our new Sec Def, at his first pentagon press conference:

The only thing - ostensibly - stopping the Democrats in congress from stopping the war is fear of right wing memes and their power. Hopefully, illustrating some of these memes will show how ridiculous they are.

The current phrasing of the Dolchstoss (stab in the back) meme (more on the definition below) is "undercutting the troops". Note "cut" in the root of the verb. Other phrasings include "undermining" the troops and "not supporting" the troops.

Just last week, right-wing propagandist/enabler Chris Wallace served up some Dolchstoss for Dick "Dick" Cheney: