As nearly everyone has pointed out today, Ryan lied in last night's speech when he held Obama responsible for the closing of the Janesville GM plant.
GM made the decision to close the plant during the Bush administration nearly a year before Obama took office. Ryan knows that his accusation was a lie, because Ryan and both Wisconsin Senators, Russ Feingold and Herb Kohl, wrote GM Chairman and CEO Richard Wagoner on June 3, 2008, pleading with him to keep the plant open.
Barack Obama became President as of January 20, 2009.
As of this writing, that letter is available on Paul Ryan's House website.
In the event Ryan's staff decides the letter being on his office site could be inconvenient for the Congressman, I have embedded it here.
Ryan ltr GM