By David Morgan and Richard Cowan WASHINGTON (Reuters) – The third day of Donald Trump’s Senate impeachment trial got underway on Thursday, with the Democrats who are making the case for his conviction for inciting the deadly rampage at the U.S. Capitol set to focus on the damage wrought in the rampage and the former president’s role in inflaming the rioters. As the Senate reconvened on Thursday, the nine House of Representatives lawmakers serving as prosecutors planned to illustrate the riot’s “terrible toll” and Trump’s “role in assembling, inciting and inflaming the insurrectionists,” a Hou…