This (via Swing State Project) is really not ok:
It’s customary in a primary election for the losing candidate to campaign for their party’s nominee in the fall.
But if she loses Tuesday’s Democratic primary for U.S. Senate, Secretary of State Jennifer Brunner won’t be telling Democrats to vote for the party nominee in November.
Asked by a Dayton Daily News reporter last week how much she would work for Lt. Gov. Lee Fisher if he wins and she loses, Brunner held up her hand and formed a zero.
To be clear, there's not a huge ideological gulf between the candidates in this primary. The ideological gulf in this race is between either of the Democrats and Republican Rob Portman. That would be the Rob Portman who is counted as one of the five major Republican Senate candidates to have flirted with birtherism. The Rob Portman who headed the Office of Management and Budget under George W. Bush.
Barring a primary between people from the absolute opposite edges of the party -- between, say, Blanche Lincoln and Al Franken -- we should never hear one of our candidates saying they wouldn't support the ultimate nominee. We have to demand better than Brunner's current stance.