[img]http://d.yimg.com/a/p/afp/20100608/capt.photo_1275963078768-1-0.jpg?x=130&y=89&q=85&sig=OWddpk2P6PvC23qBdHqW1g--[/img]AP - Anxious congressional incumbents and establishment candidates from Arkansas to California made their final pitch to primary voters Tuesday, mindful that they could be the next to fall in an unpredictable election year that has claimed several veteran lawmakers.