Breaking down the Senate battlegrounds, with Mark Murray and Jessica Taylor

The generic ballot is dead even at 46-46 between Democrats and Republicans, according to the latest NBC News poll, with Senate candidates on either side duking it out on on a diverse set of priorities from one state to the next. NBC News Senior Political Editor Mark Murray and Jessica Taylor, the Senate and Governors editor for the Cook Political Report with Amy Walter, join Chuck to break down the races to watch, just about six weeks out from the midterms.