1. The recall grew out of the protests — the vibrant, passionate protests — against Scott Walker's cutback of collective bargaining rights, and Tom Barrett, by campaigning on anything but union rights, has betrayed the original intent of the recall.
2. Don't reward the Democratic Party for appropriating the protest energy — which had that real, left-wing progressive spirit — and handing it to a bland moderate who stands for nothing much than not being Scott Walker. If this works for them, they'll keep trying to do it, and your movement will always be coopted. You're a protester: Register a protest vote.
3. Scott Walker has been a great foil for left-wing politics, a great arch-enemy. Tom Barrett won't do any of the things you really want, and you'll be stuck more or less supporting him. You'll become middle-of-the-road and deactivated.
4. If Scott Walker loses, it won't be by much, and the people who support him will be outraged and energized. Remember how you felt when he announced his reforms in February 2011? They'll feel something like that. It will be the Tea Party Summer, going into the fall elections.
5. Vote against recall politics generally. This is not a normal way for a democracy to work. You can show some sympathy with the ordinary Wisconsinites who don't like their lives disrupted this way.