Because she is divisive and her ideas and policies are impractical. Just because I subscribe to a certain ideology doesn't mean that I think that radical shifts are the right thing for the country. Pelosi is a bitch and things like this prove it, this is retarded as I already stated. Reid is her lapdog, so I can't stand him for two reasons 1) going along with Pelosi and 2) his lack of testicles. Obama is my guy and has reached across the aisle infinitely more than Pelosi. I feel pretty much the same way about Kennedy and the Clintons (although I like Bill much more than Hillary). John Kerry sits in Al Gore territory for me, I wish he would just disappear.
So yes, it does matter who is pushing the liberal agenda, and no I don't have to agree with or like someone just because they share my ideals, but lack the tact or patience to find better ways to work towards them.