3 vulnerable Senate Democrats to skip DNC

Washington — Three vulnerable Senate Democrats plan to skip next week's Democratic National Convention in Chicago, where members of their party will gather to celebrate Vice President Kamala Harris as the nominee. 

Sens. Jon Tester of Montana, Jacky Rosen of Nevada and Sherrod Brown of Ohio will be absent as Democrats convene for the four-day event, sources familiar with the matter told CBS News.

All three are in tight races that could determine control of the Senate. Tester is the only one of the bunch who has not endorsed Harris' presidential bid.