Yes the plant slowed production in December.
When was Obama running for office?
When did he make the promises?
When was he elected?
When did the plant close? May 2009. It stopped producing SUVs in December 2008. It still built Isuzu trucks until being put in a "standby capacity" in May 2009.
Knowing the plant was scheduled for a shutdown at years end candidate Obama promised to support having GM retool the plant to build other vehicles. No such government effort ever happened.
http://cnsnews.com/news/article/janesville-gm-plant-closed-2009-after-obama-promised-save-it