My laptop charger is "broken"? - Doesn't recharge unless you push hard into laptop.?

I don't know why but my laptop charger doesn't even really work. You have to push with substantial force on the charger into the hole for it to recharge. My laptop's a Lenovo Windows 7 that's pretty new. The charger is just a circular plug that you put into the back/right corner. Is this like a defect in the model?