Stocks trod water as investors assess the chances of the Dow succeeding in another bid to cross 40,000 for the first time.
The latest offer amounted to around a third of what the campaigner had asked for.
Oregon has multiple hotly contested primaries on Tuesday, as well as some that will set the stage for high-profile races in November. Oregon's 5th Congressional District is home to one of the top Democratic primaries in the country. It pits Jamie McLeod-Skinner against Janelle Bynum.