John Avlon: Since the election, Republican talking points have reflected the fact that they need to reach out beyond their base: to be positive rather than negative; appear more reasonable, less obstructionist. But how you act speaks more loudly than what you say, and Senate Republicans have doubled down on obstructionism with their shameful filibuster of secretary-of-defense nominee Chuck Hagel. Add to this fresh insult the hold Sen. Rand Paul put on Obama's nominee to be CIA director, John Brennan, and it looks like Republicans are backing a cynical political strategy that could compromise national security while proliferating hyperpartisanship even further in the future.