To be honest, there aren't very many. This is from someone who has followed the cut and thrust of debate, contemporary culture, campaigns, elections, and so on for the better part of thirty years. Very often your guys lose, and even if they win they tend to disappoint while in office.
But, occasionally one does get a bit of Schadenfreude when the other team pulls out all the stops and loses anyway. I've got a feeling this is about to happen to Ned Lamont in the Connecticut Democratic Senatorial primary. For those who are blissfully unaware, Ned Lamont is running against Sen. Joe Lieberman. Unlike some on the Right, I'm not particularly enamored with Sen. Joe. In the 2000 campaign Joe repudiated most of the principled positions he ever took in order to get on the bottom end of the Presidential ticket. Ever since then I thought he was truly much more Machiavellian than his persona would lead you to believe.
I even agree with at least part of the complaint against him. If he loses the Democratic primary he get out of the race and support the winner. If he wants to run as an independent he should run as an independent now and let the D's nominate somebody else.
But reading the tea leaves it looks to me like he will win anyway, which means that the Internet-savvy hard left netroots will still be oh-for-life in real elections. This one especially will hurt, for all the hatred they have poured onto Joe's head combined with the realization that he will still be there.