The GOP issued an ultimatim – pledge undying loyalty as a politician or GTFO.
They say it’s because too many Republicans are going independent or Democrat, but the reality is that they are more afraid of the party splitting the vote between the GOP and the Tea Party during the 2012 elections. Which is bad news.
Honestly, the Tea Party is the spoiler for 2012. If they produce their own candidates separate from the Republican party, they will split the vote and the Democrats will win the Senate/Governor seats. This is a last-ditch effort to stem the tide before 2012.