Well, a concession has no legal merit and, if by some miracle he pulled it off, the concession means nothing. However, from my understanding, Tom McClintock conceded because mathmatically, he wouldn't have won the remaining absontee ballots. According to dpwiener, he needed to win 62 percent of the rest of the ballots left to count, and thats is really unlikely (especially since, I believe the remaining ballots left to count include LA County which, even absontee ballots, might have a liberal lean unfortuently).