I have been waiting for this billboard. I am surprised it took this long for it to show up. The good aspect? It's going to be up for six months, and as predictable as Obama is, he's going to make the case for that billboard. 'Impeach Obama' billboard along Hwy. 41 OSHKOSH - A controversial billboard along Highway 41 is catching people's attention. It calls for President Obama to be removed from office. The spot, near the Oshkosh Correctional Institute, is also becoming a popular spot for motorists to pull over and snap a picture. "The sign kind of struck…