One positive thing Joe Biden can take away from our poll is that no other candidate seems to have an ability to break through with moderate or conservative voters. Among this group, Biden is ahead with 31%. The next strongest candidate is Harris with 11%.

Indeed, all the top polling candidates besides Biden do better with liberal than moderate/conservative voters. That's potentially an issue for non-Biden Democrats because about half of potential primary voters self-identify as either moderate or conservative. They're the group powering Biden's lead right now.

It shouldn't be too surprising that Biden is ahead with moderate/conservative Democrats. All the other candidates in double digits overall (Harris, Bernie Sanders and Elizabeth Warren) have very liberal congressional voting records. Biden's the only one whose record can in anyway be described as moderate.

The lack of choices that moderates have may explain why Biden's drop among moderate/conservative voters in this poll compared to last was only about half that of his drop among liberal Democrats. The lack of choices may also allow another candidate not polling in the top tier right now to rise. Failing that, however, Biden will be the only choice for voters looking for a moderate.

The lack of choices for moderate/conservatives also may explain why just 29% of them are very satisfied with their primary choices. That's far lower than the 47% of liberals who say so.