What do you think about Tea Party victories in the primaries?

Yesterday Christine O’Connell won the Republican primary in Delaware in a surprising upset. She beat Mike Castle, who has served in the House of Representatives for 9 terms. He’s more of a moderate; she’s quite conservative (among other things, she has equated masturbation to adultery because it involves “lust in the heart”)

What do you think about upset victories like this one (other races, including the NY Republican gubernatorial primary, also went to Tea party challengers)? Do you think these candidates can win in a general election? What does it mean for the Republican party?