The Reuters/Ipsos/UVA Center for Politics poll released on Wednesday found that 44 percent of likely Missouri voters said they would support McCaskill in the Nov. 6 congressional elections, while 45 percent backed Republican challenger and state Attorney General Josh Hawley. Other recent polls also showed the Missouri race as a toss-up. Democrats need to gain two seats to win control of the U.S. Senate, where they could act as a check on Republican President Donald Trump.