Yes, but the key is WHICH races to go out on a limb for. Of course there are examples, examined post fact, in which we wish we had invested more. That's useless information unless you have it BEFORE the fact. And short of having enough bucks to heavily fund EVERY challenger in EVERY unlikely district in the country (and who knows, maybe we do) it falls on the leaders of the liberal blogosphere, such as yourself, to pick out the ones we should focus on. And that does not mean every single damn one.