Research 2000 conducted an Iowa poll of 600 “likely voters who vote regularly in state elections” for KCCI-TV, the CBS affiliate in Des Moines. The poll was in the field from February 15 to 17, and KCCI published the results on its website yesterday.

It’s not a good poll for Governor Chet Culver, but it’s less bad than the Des Moines Register’s latest Iowa poll. Chuck Grassley has a comfortable lead in the Senate race, but not the kind of margin he has enjoyed against previous Democratic opponents.

Click here for all the numbers, and join me after the jump for some analysis.

First, a few words about the sample for the Research 2000 poll, which contained 33 percent Democrats, 29 percent Republicans, and 38 percent independents. That seems like a reasonable reflection of the current Iowa universe of registered voters.

However, the actual Iowa electorate for the 2006 general election (pdf file available here) contained about 37 percent Democrats, 37 percent Republicans, and 26 percent independents. Of course there’s no guarantee that the 2010 electorate will look the same as the 2006 electorate, but I doubt no-party voters will outnumber partisans in an off-year election. The poll could be off by more than the 4 percent margin of error if the sample is skewed.

Research 2000 found just 42 percent of respondents approved of Chet Culver’s performance as governor, while 51 percent disapproved. It’s never good to be “upside down” on job approval. Culver’s favorability numbers were a little better: 44 percent favorable, 43 percent unfavorable.

Terry Branstad led Culver 54 percent to 38 percent, with only 8 percent of respondents undecided. That’s not good, but it’s not as bad as the 20-point lead Branstad had in the Des Moines Register poll. Branstad led Culver 89 percent to 5 percent among Republicans and 60 percent to 32 percent among independents. Culver led 74 percent to 17 percent among Democrats.

If this poll assumed too high a proportion of independents in the general electorate, then Branstad’s lead over Culver may be smaller than this poll would indicate. But Culver needs to bring up his numbers and bring down Branstad’s favorability. Research 2000 found that 61 percent of respondents had a favorable impression of Branstad and just 24 percent unfavorable. The Republican primary campaign may bring Branstad down to earth a little, but Iowa Democrats have their work cut out for them. Branstad even led Culver among women in this survey.

Culver led all other Republicans in the Research 2000 poll but didn’t break 50 percent against any of them. He led Bob Vander Plaats by 41 to 38. In that matchup, independents were evenly divided, but I think Culver would end up doing better among independents if Vander Plaats pulled off an upset in the primary. Culver led State Representative Rod Roberts by 48 percent to 26 percent, and State Representative Chris Rants (who quit the race yesterday) by 44 percent to 33 percent.

Unfortunately, this poll didn’t test the Republican primary. What’s it gonna take to get us a public poll on Branstad against Vander Plaats? Maybe the Des Moines Register will publish numbers on that this weekend.

Now on to the U.S. Senate race. The Research 2000 poll for KCCI only tested Roxanne Conlin against five-term incumbent Grassley. (I think they should have run the numbers for all the Democratic candidates, especially since they polled Rants and Roberts in the governor’s race.)

Grassley’s favorable/unfavorable numbers were 59/35, and Conlin’s were 41/36, with 23 percent having no opinion of her. Unfortunately, they didn’t ask about Grassley’s job approval numbers. For Culver and President Barack Obama, favorability numbers were better than job approval. (Obama was at 52 favorable/41 unfavorable in this poll, but his job approval/disapproval numbers were 49/46.) For many years Grassley had approval ratings in the high 60s and low 70s, but if his favorability is only 59 percent now, his approval is probably a bit lower than that.

Research 2000 found Grassley leading Conlin by 56 to 35 percent. He had a much larger lead among men (62-30) than among women (50-40). Right now Grassley appears to be outside the danger zone, but I doubt he will be re-elected with anything like the 66 percent to 70 percent numbers he’s had in the past. If the Democratic nominee can hold him below 60 percent, or better yet below 55 percent, that would help our down-ticket Democratic candidates.

I’ll put up another post later on some of the other interesting findings from the Research 2000 poll. For now, share any thoughts about the gubernatorial or Senate races in this thread.