For many years when he worked at CNN, Sam Feist was a producer for “Crossfire,” which highlighted often loud political differents. Now that he is CEO of C-SPAN, Feist is looking for a different approach. The network will soon debut a new show, “CeaseFire,” that promotes conversations between political opposites trying to reach common ground. Feist has selected Dasha Burns of “Politico” to host the new program, which is debuting this fall. “Crossfire” arguably led American politicians into a more polarized place, now obvious in its politics. Feists hopes that “CeaseFire” can show Americans ways that its leaders can work together.