Regarding Iraq specifically, the Democrats' plan has two parts. First, they want Iraqis to "assum[e] primary responsibility for securing and governing their country." Then they want "responsible redeployment" (great euphemism) of American forces.
Older readers may recognize this formula. It's Vietnamization—the Nixon-Kissinger plan for extracting us from a previous mistake. But Vietnamization was not a plan for victory. It was a plan for what was called "peace with honor" and is now known as "defeat."