If we're going to clean up our caucus, its going to take a lot more than the netroots equivalent of the 'sternly worded letter' (aka calling, protesting, etc). If you really want to see people like Hoyer and Pelosi and the other invertebrates gone, you're going to have to take them down actively. No amount of logical argument will win this fight.
The first thing we'll need are volunteers with cameras and a lot of free time on their hands (I'm looking at YOU, retired people).
You see, people like Steny Hoyer are always undone by their own personal weakness and corruption. So if you really want to bring him down, simply put the focus of the blogosphere on him. Put someone in his office all day, every day, and get pictures of everyone who goes in or out. Make a flickr page and post them. Have some other citizen-journalists follow him around and get photographs of everyone he meets, everywhere he goes, and anything he does. If he sneezes, we should have a 9 megapixel photo with the particulates still flying out of his nose. Start a youtube channel called "Steny TV" and record everything he says and does. Use open records requests to get every single document you can out of his office and put them up on wikileaks.
Hoyer is like an insect. Put him under the magnifying glass and the sunlight will do the rest.
But thats if you really want to bring him down.