I think you and Dan (Below me) are a little mistaken. He was referring to the Blood Elf leaders, not every factions' leaders. The Blood Elf leaders he is referring to are Lor'themar Theron, Grand Magister Rommath, and Halduron Brightwing. You could also consider Lady Liadrin as one of the leaders.

He said that Priests don't have a leader that represents them. Lor'themar and Brightwing are rangers who represent Hunters and possibly Rogues, Rommath is a Mage who represents Magi and most likely Warlocks, and Lady Liadrin is a Paladin who represents Paladins. Priests are left all by themselves without someone to properly represent the in their government.

It could be argued by some uninformed that Liadrin could be representing the Priests, but she and all the Blood Knights, former to the events following after Kael'thas Sunstrider kidnapped M'uru, got their ability to control the Light from the energies emanating from M'uru while the Priests still got their power willingly given up by The Light, making an possibility of the two classes being linked implausible.

Are we sure the priests didn't force the light like the paladins? I haven't seen anything saying that, though most of the emphasis has been on the blood knights. I think it would be more plausible to believe the blood elve priests are the same as the paladins, it's just how they are. If they could've used the light legitimately, I don't think they'd have forced the Naaru light that.
Having the priests be all pure like they should doesn't seem very blood elf-y.

@Kazeko: Or you could assume that the blood elf priests acted like normal priests. The Light didn't abandon them and if other elves wanted to think it had, that's up to them.

blizzard never really says anything about priests when it comes to the elven society. It seems to me that it's totally up to your own interpretation.

@kazeko.fuuga

As you said, there isn't any evidence that the Blood Elven Priests didn't take their power from M'uru, and there isn't any evidence to say that they did. Much of the information on the Official World of Warcraft: Burning Crusade "Blood Knight" page make you think that they didn't get their power from the Narru. It makes it look like all of the people that went and took their power from the Narru, became Blood Knights.

If you wanna look for yourself, I'll go ahead and post a link for ya.
http://www.worldofwarcraft.com/burningcrusade/townhall/classcombo.html

The elves were priests in warcraft 3 long before the blood knights captured the naaru. They follow the light much like the rest of azeroth's priests

Actually, Liadrin was a priestess who believed the Light abandoned her after she consumed fel magics. When M'uru was delivered, she became the first Blood Knight; like Uther, she was a priest who learned to fight, rather than like Turalyon who was a warrior that believed. While it was never stated that *all* elven priests lost their connection to the divine, the ones who did worship the Light were severed from their power. Since the only known faith practiced by the eastern elves was Light-worship, it seems pretty likely that some priests were powered by M'uru, just like the paladins. It's also possible that some belfy priests picked up the Forgotten Shadow after the alliance with the Forsaken; a shared racial spell (Touch of Weakness, wasn't it?) hints at this possibility.