John McCain was booed passionately by the hard line conservatives attending the CPAC convention today as he brought up his position and support for Bush's immigration plan which is a sore spot for many there. It seemed like his supporters filled the room for the speech and they quickly came to his aid by cheering loudly. Many conservatives don't seem to be on-board the Straight Talk express.

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Think Progress writes:

McCAIN: Surely, I have held other positions that have not met with widespread agreement from conservatives. I won’t pretend otherwise, nor would you permit me to forget it. On — on the issue of illegal immigration, a position which –

CROWD: Boo! Boo!

This morning, Politico reported that CPAC organizers had instructed conference attendees not to boo McCain. Last year, McCain was the only major Republican presidential candidate to skip CPAC.