Democrats are celebrating Donald Trump's status as the presumptive Republican presidential nominee because they feel it will help them in November.The Democratic Senatorial Campaign Committee (DSCC), for example, has started attacking Republicans in Senate races this year, linking those politicians with Trump.The National Republican Senatorial Committee (NRSC) says the attacks from the left won't get them very far."There is a reason Democrats aren't lining up to campaign with Hillary Clinton," NRSC spokeswoman Alleigh Marre said, reports CNN. "She is a toxic candidate whose failed leadership has put the security of our country at risk."Republicans currently control both the House and Senate, but the scales could tip in November as Democrats are targeting taking back the Senate.Ohio Sen. Rob Portman, who served in the House from 1993-2005, is running for his second Senate term this year. He has pledged to endorse the Republican presidential candidate regardless of who the nominee is.Portman supported Ohio Gov. John Kasich, who suspended his White House bid this week. He has not yet commented on Trump.David Bergstein, the spokesman for Portman's opponent in the Senate race, former Ohio Gov. Ted Strickland, told CNN Portman's ties to Trump will cost him this fall."Trump at the top of the ticket will alienate the independent voters who decide elections in Ohio — while turning off moderate Republicans and energizing Democrats across the state," Bernstein said. "With the Republican National Convention in Cleveland, there will be no rock that Portman can hide under to avoid his party's toxic nominee."Other decisive races mentioned in the CNN story are taking place in Pennsylvania, Arizona, Illinois, and Wisconsin.Kyle Kondik of the University of Virginia's Center for Politics told the Washington Times Wednesday the aforementioned Senate races could mirror the presidential election in terms of who wins."Almost all of the most competitive presidential states also feature competitive Senate races, and Republicans are playing defense in most of those states," Kondik said. "It seems likely that the winner of the presidential race will probably also win the Senate, given this overlap."