If 300,000 People March, but the Press Doesn't Tell You, Did the March Take Place?

Last Wednesday, March 8th, groups across the country marched, lobbied Congress, and took other actions to protest the Border Protection, Antiterrorism, and Illegal Immigration Control Act of 2005. In Chicago an estimated 300,000 took to the streets. That estimate comes from the police department, which always low balls numbers of participants in demonstrations.
I don't recall seeing news reports mentioning the demonstration at all, much less the fact that the crowd was at least 300,000 strong.

The bill sponsored by Republican Congressman James Sensenbrenner, would make it a crime to any way assist an illegal immigrant. Don't give illegals a beds to sleep in or bowls of soup. You could end up a Halliburton detention center right along side them. No one will know you are there. The media won't bother to report that the centers exist either.