Those that saw President Obama in Hatfield Township on Friday are likely to remember the event for a long time.   The Commander-In-Chief toured the Rodon Group, the maker of K-Nex building toys.   He also gave a speech urging Congress to extend tax cuts for the middle class.   Hatfield Township Commissioner Scott Brown said the President made his case.   Montgomery County Commissioner Bruce Castor was also impressed by the speech.   Others in the audience include the 150 or so employees of the toy making plant.   One of them said he was sure everyone made it into work that day.