The primary is just one week from tomorrow and it seems that it is going to be a close race. Here is a good article from the Waterloo/Cedar Falls Courier talking about how Culver, though in the lead in polls, can't seem to pull away.

A poll released last week by KCCI-TV showed him with 38 percent of the vote among likely Democratic voters. That's just 3 percent more than the 35 percent he needs to win the primary outright. And with the poll's 5 percent margin of error, it's not a comfortable cushion.