Today, a third judge upheld the constitutionality of Obamacare. So if you are counting, that makes 3 federal judges in favor of Obamacare and 2 against.
Of course you won't here the news of a judge who comes out in favor of Obamacare. You will only hear the news if a judge rules it unconstitutional.
Here is a link to the story if you want to read more about it.