Three of the most talked about potential GOP presidential candidates will appear together this weekend at a panel sponsored by the Freedom Partners Chamber of Commerce, in this year's first forum of presidential hopefuls. At the group's winter meeting Sunday in Palm Springs, California, Texas Sen. Ted Cruz, Kentucky Sen. Rand Paul, and Florida Sen. Marco Rubio will participate in a panel discussion on domestic economic issues, including health care and energy policy. ABC News chief White House correspondent Jonathan Karl will moderate the discussion. {snip} The panel discussion will take place Sunday at 8:30 p.m. PT, and an ABCNews.com...