Part of this is, of course, due to the fact that Rudy and Romney are frontrunners. And part of it is due to the fact that they are both vulnerable on the issue...
Because Romney doesn't speak until tonight, and Rudy doesn't speak till tomorrow, the other candidates will have the chance to define them before they can defend themselves.
So far, the critiques have been subtle in the speeches, but they are no doubt present. For example, this morning, John McCain noted;:
"I have been pro-life my entire life. I believe I am the only candidate of either party who can make that claim."
... But handouts are a different story.
From a Fred Thompson flier being handed out by Thompson supporters at the value voters summit...
..."Fred Thompson has a 'Demonstrated record of supporting human life.'"
... "Rudy Giuliani is vocally Pro-Choice."
... "Mitt Romney was proudly Pro-Choice until 2005."
Brownback is up next. More to come...