Washington (CNN) -- In a symbolic gesture toward more civil political discourse, Democratic Sen. Charles Schumer and Republican Sen. Tom Coburn said Sunday they will sit together at the upcoming State of the Union address. Appearing on the NBC's "Meet the Press," Schumer and Coburn called for political debate based on issues and ideology, rather than motives and personal attacks, in the aftermath of the Tucson, Arizona, shootings last week that killed six people and critically injured Democratic Rep. Gabrielle Giffords. Schumer acknowledged that sitting with Coburn for the president's annual speech to Congress would be symbolic, "but maybe it...