It sounds like Indiana Republican Jackie Walorski might be running again in 2012, as well:

Walorski said during an interview with The Tribune last week that she is weighing several job offers and keeping an eye on Washington politics. She said it’s possible she’ll run for office again in 2012.
“I’m watching to see what happens with redistricting, seeing if the need is the same at the federal level, seeing if things change with the new Congress,” she said. “I obviously keep an eye on things at the state level, but I think the pressing need at the moment is to get the spending under control at the federal level and get Americans back to work. It still is an economic crisis in the country.”

She sees a last-minute mailer as the deciding factor in her narrow defeat:

On the Saturday before the election, she saw a mailer advertising Libertarian Mark Vogel as the “true conservative” in the 2nd District race. The Indiana Democratic Party reportedly spent $15,000 on the pieces and sent them to 20,000 households in the district. [Incumbent Democrat Joe] Donnelly ended up beating Walorski by about 2,500 votes, while nearly 9,500 voters cast their ballots for Vogel. Walorski said she has “no doubt” she would have won the election if not for that mailer.

The margin of victory in that House race was 1.3 percent, the 12th closest House race in the country.