There are very few Congressional candidates this cycle who have tied their electoral fortunes so closely to Democratic presidential nominee Sen. Barack Obama (Ill.) than business consultant Dan Seals (D).

Seals, who is challenging Rep. Mark Kirk (R) in Illinois’ suburban 10th district, is set to air an ad Thursday evening that highlights his ties to Obama.

The ad, Seals’ first of the campaign, will air on the four broadcast networks during their coverage of Obama’s speech, and on CNN and MSNBC.

The 30-second spot, produced by media firm Adelstein-Liston, features Seals, his wife, Mia, and their two young daughters watching Democratic National Convention coverage on their couch.

“Our family is excited to share with you tonight’s historic moment of change,” Seals says to the camera as the ad begins. “It’s why I’m running for Congress. Mark Kirk accuses me of supporting the ‘Obama agenda.’ Well, you bet I do.”

Seals goes on to describe his commitment to change on a range of important issues. It ends with his daughters yelling, “Go Daddy!”

Seals took 47 percent of the vote against Kirk in 2006 without much help from national Democrats. But the Democratic Congressional Campaign Committee is targeting the 10th district race this year, and Obama, the home-state Senator, is expected to do very well there — even by Kirk’s own admission.