Voting with party
The website OpenCongress tracks how often members of Congress vote with the majority of the chamber caucus.
2014
Duckworth voted with the Democratic Party 89.7 percent of the time, which ranked 162nd among the 204 House Democratic members as of July 2014.[67]
2013
Duckworth voted with the Democratic Party 92.8 percent of the time, which ranked 149th among the 201 House Democratic members as of June 2013.[68]
Duckworth would never have obtained her seat without the blessing of the IllinoisCombine-ChicagoMachine.
She basically agreed to be their token veteran.
If Boehner had a brain (too much to ask I know), there would be messages to Duckworth that maybe she should change parties.