The sentiments represent a "stunning drop in optimism for a party that began 2012 confident it would regain control of the chamber," write our Hotline On Call colleagues.
Here's the breakdown:
Asked on a scale of 0 (no chance) to 10 (virtual certainty) to rate the GOP's chances, the party insiders averaged a score of 4.4. In February, the score was 6.9.
The shift in expectations was mirrored among Democrats. Now, 59 percent of the party's insiders say the odds they will lose a Senate majority are "low." Seven months ago, only 16 percent of them were similarly confident.