Democratic Senate hopes are alive, though precarious

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 A new Marist College poll puts Democratic Sen. Joe Donnelly ahead of Republican Mike Braun 44% to 41% in the Indiana Senate race. Libertarian Lucy Brenton comes in at 8%. Without Brenton’s name mentioned, Donnelly’s lead expands to 49% to 43% over Braun.
This is the first high-quality poll of the election. Previous lower-quality polls have generally shown a tight race.
Marist released three polls in pivotal Senate races this week. When you average the results of those questions including and not including third party candidates, the other twopolls found Missouri Democratic Sen. Claire McCaskill up two points over Republican Josh Hawley and Tennessee Democrat Phil Bredesen up two points over Republican Marsha Blackburn.
As a group, these three polls suggest that Democrats still have a path to a Senate majority, though it remains difficult.Democrats need a net gain of two seats. To get there, Democrats probably need one of the following scenarios to come true.
Democrats likely need to win Republican held seats in Arizona and Nevada. Then they need to hold onto all 26 of their currently held seats, including in Indiana and Missouri.
If Democrats lose one of their seats, then they likely need to take Arizona, Nevada and Tennessee. Democrats could sub in Texas for one of these three seats, or, by carrying all four, they could afford to lose two of their seats.
As I wrote a few months ago, North Dakota’s Democratic Sen. Heidi Heitkamp is behind Republican Kevin Cramer. In most realistic scenarios in which Democrats gain Senate control, this means that Democrats cannot afford to lose any other of the seats they currently hold.