This cycle, Iraq War veteran Tammy Duckworth (above) and former Illinois Deputy Treasurer Raja Krishnamoorthi are running for the Democratic nod in the redrawn 8th district.
Another key difference is that Krishnamoorthi is a much better-funded challenger than Cegelis. Krishnamoorthi had $636,000 in the bank at the end of September, which is already more than three times what Cegelis raised for the 2006 primary.
While Duckworth bested Krishnamoorthi in third-quarter fundraising by more than $150,000, she ended the quarter with $364,000 in the bank.
Like Cegelis, who first ran for Congress in 2004, Krishnamoorthi was in the race first.
Krishnamoorthi started to take a look at running for Congress after he barely lost the 2010 Democratic primary for state comptroller. He called Duckworth for advice in January and met with Senate Majority Whip Dick Durbin (D-Ill.) and former Rep. Melissa Bean (D-Ill.) about the race.
Krishnamoorthi announced his candidacy in May, just about a week before Illinois Democrats released the new Congressional map. He lives directly in the middle of the redrawn 8th district.
"I was actively recruited to run in this district" Krishnamoorthi said in a phone interview last month. "I was definitely in this race first, and we have the backing of a tremendous number of local and community folks. But at the end of the day, this is a democracy. I have to demonstrate why I'm the best candidate."
About the same time as Krishnamoorthi's announcement, Duckworth said she saw a draft of the new Congressional maps.
"I realized that over half of the new 8th were going to be parts of the 6th that I won in 2006, and none of the parts that I had lost," Duckworth said in a phone interview in October. "That's when I thought, 'Drats. I'm going to have to quit my job and go run for Congress.'"
Duckworth said her former job in the Department of Veterans Affairs prevented her from exploring a bid, except for speaking with the White House about it.
After she left her position June 30, Duckworth started calling local officials to gauge their support, including Durbin and another one of her top 2006 backers, Chicago Mayor Rahm Emanuel.
Within a week, Duckworth announced a second bid for Congress. About one month later, Durbin endorsed her — a rare move for a senior Democrat who almost always stays neutral in his home state's primaries.
While Duckworth said she would welcome support from Emanuel or the president again, that's not her focus this time.
"I'm not asking. I would not put the president in that situation, just like I wouldn't put the mayor in that situation," she said. "And frankly, I'm really focused on going out in the district. At the end of the day, it's going to be about those folks."
Former Sen. Scott Brown, R-Mass., candidate for U.S. Senate in New Hampshire, holds his hand over his heart during the singing of the national anthem as he waits to take the stage for his town hall campaign rally with Sen. John McCain at the Pinkerton Academy in Derry, N.H., on Monday, Aug. 18, 2014.