A Market Shares poll conducted for the Chicago Tribune shows that state Treasurer Alexi Giannoulias (D) and U.S. Rep. Mark Kirk (R) are leading in their respective races for the U.S. Senate nominations in Illinois. But a significant share of voters in each primary remain undecided with just over a week until election day.

Primary Election Matchups
Giannoulias 34 (+3 vs. last poll, 12/2-8)
Jackson 19 (+2)
Hoffman 16 (+7)
Other 5 (-3)
Und 26 (-9)

Kirk 47 (+6)
Hughes 8 (+5)
Other 10 (unch)
Und 35 (-11)

National Democrats have been playing up supposed conservative unease with Kirk, who has a more centrist voting record that comes from representing a swing suburban district. Kirk has been targeted most notably for his vote in favor of the cap-and-trade legislation the House approved in 2009. But the Tribune notes:

More than half of GOP voters said they agreed with the tea party movement, including nearly 70 percent of those who describe themselves as very conservative. But that hasn't translated into support for Hughes. The survey found Kirk being supported by 48 percent of Republicans who said they backed the tea party movement while Hughes got only 10 percent support.

Favorable Ratings
Giannoulias 38 / 8
Jackson 22 / 3
Hoffman 19 / 3

Kirk 41 / 9
Hughes 10 / 2

The survey was conducted statewide from January 16-20. The Democratic sample was 601 likely voters, while the GOP sample was 592 likely voters. The margin of error in both is +/- 4%.

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