Retired Justice Sandra Day O'Connor has shown her lack of party loyalty by publicly saying on Phoenix television that President Obama should nominate a justice to replace Antonin Scalia and the Senate should hold hearings. Twenty five of 54 GOP Senators have failed to publicly proclaim that whomever the POTUS sends up should be defeated on the spot.
To enforce discipline conservative groups are spending on advertising to support that position. The media is polling on the topic and finds the nation split..
This is a nice extra layer to the normal election year politics.