Wow! Talk about mercinary tactics?

The far right of the Republican party, i.e. conservatives, evangelicals, neocons, etc. are prepared to throw John McCain under the electoral bus because he doesn't subscribe to there far right agenda. They don't seem to consider that the main stream of the Republican party supports him. Is this a case of the far right throwing a fit? Are they taking their ball and going home just because they don't get what they want? Are they that selfish? Ann Coulter says she will vote for Hilary rather than McCain; their messiah Rush Limbaugh berates McCain at every chance. Is the far right fracturing? Are they tearing each other apart? Is this because their right wing coalition is based on negativity and pressuring others in the party to bow to their agenda?