Undeclared Democratic superdelegates who are also members of Congress are under especially great pressure, reports the LA Times: The popularity of their chosen candidate could affect their re-election chances. In swing districts, "somebody unpopular at the top of the ticket can actually cost you votes," says a political science professor.
                                    
                                    
                                
                                
                             
                            
                            
                            
                            
                            
                                
                                
                                    
                                        Says Indiana's Baron Hill, who puzzled some constituents when he endorsed Barack Obama last week, “If I'd made a political decision, I just would have stayed out of it.”