Democrats on Monday called on the chief executive of Clear Channel Communications to denounce remarks by radio talk show host Rush Limbaugh, whom they say made a “hateful” and “unpatriotic” attack on U.S. troops opposed to the war in Iraq. At issue is a remark from Limbaugh that characterized such troops as “phony soldiers.” Democrats have seized on the issue, allowing them to hit back at Republicans who similarly latched onto a MoveOn.org ad that referred to Gen. David Petraeus as “General Betray Us.” “Thousands of active troops and veterans were subjected to Mr. Limbaugh’s unpatriotic and indefensible comments on...